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it's totally possible, It's not gonna be easy though. I suggest you read the books 4 hour work week, Think and grow rich and Rich Dad Poor Dad. Mere learning is of no good unless you take action. Step 1: Read the books which millionaires recommend(above mentioned books), take ACTION, be a millionaire by 21.

My advice is to quit dreaming. There isn't enough time. But you could take the risky route and invent something that everyone needs but they don't have and they don't know that they need it.

it won't happen in 4 yrs, I advise you to rethink your goals and set them toward something that is realistic

Think smaller. Property prices are 10 times that or more

My advise is to stop wasting your time delivering papers and find something more that has the potential to pay you a lot more in the long run. Willing to work hard is one thing. You have to make sure you put your time into something that can yield the results you want.

unless you have your money saved from paper rounds invested properly, you will not see any gains

Where are you going to get the other 100 K to buy your first property?

UK

Nice sstart on saving. Keep it up. Being a property millionairre by 21 just isn't going to happen, but might be possible much longer term.

Move to another planet.

It's not happening on this one.

I'd get out of paper delivery and get into buying property for starters.

Lower your expectations.

Stay in school.