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If your not abstaining due to religious reasons(which I doubt because you admitted to watching porn) then you clearly have an issue with confidence and trust issues with men.  I hate to be so blunt and a tad rude but this kind of hints to some sort of trauma involving a man, possibly in your childhood or even even in early adulthood.  If that is the case then you may want to seek professional help(counselor, therapy ETC).  

If my aim is off, then you just need to lighten up and be more confident.  Obviously this guy likes you, other guys like you and find you attractive.  Try to laugh and smile more, be yourself.  In life you need to be comfortable with who you are, if someone does not like you for who you are, then quite simply that person/group are not your people.  

I used to have the same kind of issue with women, mine came from childhood bullying.  I was overweight and teased by mainly girls as I got older.  I lost all the weight and underneath it I was a pretty good looking dude.  But, I still had confidence issues.  Once I became more laid back and comfortable with who I was, it was a breeze to be confident and attract members of the opposite sex and have relationships/sex ETC.  Remember, confidence isn't thinking everyone will like you, its being ok if they end up not liking you.

Wow, you're being way too hard on yourself. Your situation is actually a beautiful thing. Stay strong and save yourself for marriage. If you do, you'll never regret it.

May I suggest that the first question to ask yourself when considering whether or not to date someone is, “Is this person a strong person?” If they’re not, no matter how much you like them, how much they like you, or how “cute” or “hot” they are, - please don’t date them. A strong person has good character (honesty, integrity, trustworthiness), displays a positive attitude (cheerful, caring, friendly, forgiving, helpful, and respectful), fulfills their responsibilities (for handling people who are pains in a positive way, for always trying to make a good choice, for taking care of themselves, for serving others), gives their best effort, and demonstrates self-control (of their body, anger, mouth and money).

My suggestion is that you put in the effort necessary to become a strong person (if you’re not already) and eventually look for this type of guy (otherwise you’re setting yourself up for a broken heart). Unfortunately this type of man is difficult to find – but save yourself the heartache and don’t settle for less.

(Please remember that you eventually want a 50 or 60 year marriage - not a 5 or 10 year marriage.)

Hope this helps!

PS Here are "21 tips that could help you to attract a strong person" from the book True Love Lasts:

1. Take the time and put in the effort to become a strong person yourself (this is the most important tip)

2. Put yourself in as many situations as possible that will allow you to potentially come in contact with other strong people - community service organizations, the library, high school or college clubs, the “Y” or other workout facilities, religious book studies, coffee shops, non-alcoholic parties, bookstores, concerts (wear a good pair of earplugs to protect your ears from permanent hearing loss), co-ed recreational athletic teams, community service projects, mission trips, volunteer service, etc. Try to get to know other people as much as possible without dating

3. Be cheerful, approachable, and friendly - smile regularly to put others at ease (let people see your positive attitude)

4. Take a real interest in getting to know others. Ask people an open-ended question about themselves in order to get them talking. Share things related to what’s been said as needed to keep the conversation going. Then ask them another question

5. Be polite and kind to everyone - even to people who you don’t like or enjoy being around

6. If you decide to not accept a request for a date, do it in a kind way (being rude isn’t a good choice and it doesn’t help you - word about it will get out and you’ll become less approachable)

7. Be confident about yourself - if you’re trying to become a stronger person each day, you already have a lot going for you

8. Be humble - don’t act like you’re Miss Charming or you’re Mr. Wonderful

9. Don’t be concerned about whether or not someone likes you

10. Have the attitude that if someone doesn’t like you - they don’t really know you

11. Take care of yourself by getting enough sleep (at least nine hours for teens, at least seven hours for adults according to the experts), exercising regularly (if approved by your doctor), and eating a healthy diet

12. Develop a good sense of humor - including the ability to laugh at your own mistakes

13. Be known as a hard worker

14. Dress well and dress modestly at the same time (wearing seductive clothing doesn’t attract another strong person)

15. Pay attention to your appearance, but don’t obsess over it (remember that strong people are attracted to other strong people, they’re not too concerned about looks - because they realize that looks fade with age). If you use makeup, make sure it’s not excessive. Use perfumes and colognes sparingly - if at all

16. Truly care about other people

17. Stay in close communication with real friends who can help you through the ups and downs of life and hold you accountable

18. Be patient - real friends can help you with this

19. Persevere - please remember that almost nothing worthwhile is quick and easy. Please don’t settle for dating a weak person

20. Don’t take it personally if someone doesn’t want to date you

21. Don’t act desperate for a date

There is nothing "wrong" with you. All the platitudes about "right person" etc etc spring to mind and they are all true. Sex should not be forced you need yo feel comfortable and sexually attracted to them. If not then move on. When you find someone you will know. There is a question that only you can answer. Maybe men are not a turn on for you.

I understand, I am a couple of years younger than you and have never had a  serious boyfriend either, I’ve realized though that I don’t want to settle, it is such a great quality, because I’m sure you could find a boyfriend very easily but you don’t want to settle for less than what you know you deserve, I always tell myself that the right person will come along, my sister who’s been in a few relationships always tells me that when you know you know, and that you feel an instant connection...unfortunately i haven’t felt it yet, but I have hope that I will, and I know that you will too!