Lethally, you've posted here before under a different name, but I would wager the only reason you "fancy" the second guy more is because you know him less.
Your feelings are proof positive that you are not ready to settle down to one serious relationship. So why should you have to choose? See both of them! Unless #1 wants an exclusive relationship, in which case you can truthfully tell him you're not ready for that.
Go now, and have fun!
(P.S. This is exactly what you SHOULD feel when you're 17!)
lol