First of all, Yes, I am a atheist. I am a firm believer in evolution (Yes, I have read both the bible and the orgin of the species. I have a educated opinion), and I do not believe in God. I am here to ask you all why, as your bible preaches both tolerance and loving, People threaten to kill, torture and lunch me for no other reason that not agreeing with you.
Who has threatened to kill, torture and lynch you? That's no christian behavior for sure and people who'd do that to you cannot be true christians. The Bible indeed calls us to non-violence and not judging anyone; God is the one who searches everyone's hearts and judges us.
I am 14. I drink (Legal drinking age in Denmark is virtually nonexistant), I party, I do things that will probably send me straight to hell.
Everyone of us sins, regardless of whether you're christian or not. Now, many of us make it sound as if some sins - like drinking and having premarital sex or such - were so much worse then any others and have the we're-so-much-better-people-then-you-attitude, when in fact none of that is true. Every sin is as bad as another, and yet every sin has been forgiven for those that want to have that forgiveness. Read the Letter to Romans again for a more realistic point of view of a christian on sin.
[Just as a side note - and I don't want to sound preachy now - are you aware that drinking so young actually disturbs and hinders your brain development and that it can never be repaired once the damage is done? You should at least consider taking better care of yourself!]
I also get top grades, have lots of friends, help my local community and my family. Am I a bad person? I'm a nihilistic atheist, meaning that I believe that humans just are. We have no real purpose other than to duplicate and keep the race alive, therefore, we might as well get the best of it.
Now, I ask you. What's your opinion? do you agree/disagree with me?
also, keep the discussion civil, please.
You obviously have some good stuff going for you, now that you don't have trouble at school, you've got friends and are on good terms with your parents as well and do some good things in your community. Keep that like it is, it's nice to hear that you have such a good attitude.

What I worry about is whether you yourself feel good and whether you enjoy what you have. Why do you drink and party so hard? Would you still be accepted among your friends if you chose differently? Your tone is really defensive, why? Do you feel threatened by the message christians have? You don't need to answer these questions for me, just consider them for your own sake.
Now to your question. In the obvious part I disagree with you; I'm a christian and I don't thin nihilism is the way to go either. And I don't think we have no purpose. Instead I believe, that we've got talents and ambitions for a reason, and that reason is using them for something good. I believe God has planned it that way and smiles upon us when we find ways of using them for His work. That's my opinion on the reason of living. I must agree with you, when you say we ought to just make the best of life. Yes, I and all other christians believe that we've got an eternal life in Heaven that must be better then anything I can think of now, but it so doesn't mean that I though I needed to suffer here. It is said that "the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness and self-control" (Gal. 5:22-23). Yes, it includes joy and love among others! That's why I'm going to enjoy my life despite - and also because - I'm a christian.
Ok, that was just my two cents. I hope you got something out of it.

Have a nice week!