Most Helpful Guy
It's absolutely possible. The question is, is it legal. Look up the age of consent law (s) where you live. It is 16 for most of the world and at least half of America.
Go for it if you want but realize that he is only in it for the sex.
Most Helpful Girl
Seeing as you're 14, it's illegal. Give yourself some time to grow. If he's still there in 4 years, see how you feel about the situation then. A relationship between adults really depends on how your maturity and your partner's maturity fit together, not how many years are in between.