Monkey, I've written in on two prior occasions, and your advice has always been painfully honest, so I thought I'd try a third time.  I am in the midst of an emotional breakdown. There, I said it.

The last two guys I've dated have used, and as of, I'd say, about five minutes ago, I was lead on only to be rejected by this total jerkoff.

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Wow.  Crazy trish is right...
 
Okay, breathe.  Before you ask if there are any nice guys out there, ask yourself what it is you are doing that is allowing yourself to be used and lead on.  Consider this your 3rd strike and if it happens again, it's your fault, not theirs.  You've already let it happen to you 3 times...what would that make you if it happened a 4th? 

Don't be so desperate.  Kick back and learn to let them come to you.  And if you're patient, they will.  You're just not giving it enough time to let them make their move.  And if they don't, they don't.  The good news is you will never 'humiliate' yourself again.  Don't sweat it, we've all done it.  Phuck, I'm in my 30's and I still humiliate myself in front of women...

We all go through or have been through your situation, so calm the phuck down.  This will all be very funny to you in a few years.  Don't give yourself away.  If you need attention or acceptance, look to your parents, not some jerk off in your class; you're parent will never let you down.  There are nice guys out there, but at your age girls, don't want nice; which is why you keep subjecting yourself to this abuse.  So just stop it.  You're good enough without it.  Savvy?