i think that's what the Achtung trilogy is all about! that's why i adore that album so much (aside from the thrilling music, and the fact that my life is improved by the simple existence of "one").
to me, it seems like the Bible is less of a rule book, and perhaps more of a historical text and perhaps, through the example of Jesus, a sort of haigography of someone who we should all try and emulate.
what that doesn't mean is that we walk through our lives constantly asking WWJD when it comes to, say, drinking in high school or having a one night stand. my instinct would be to try and make the best decisions you can, but be aware of your humanness, your fallability, your weaknesses, your shortcomings, the fact that, yes, sometimes you wake up next to a stranger and you feel emptiness. but it is that feeling of emptiness that should, in the long run, lead you back to a feeling of fulfillment. because you've felt pain, you can know joy. because you haven't lead an uptight existence trying to follow biblical instructions down to the very letter, you've LIVED enough, and been human enough, for you to return to those passages and instead of receiving them as instructions or knowledge, you receive them as wisdom. they are now lived-in.
this is not to say: drink! fuck! do drugs! get in fights! but it is to say, trust yourself! believe in yourself! try to do the right thing! don't beat yourself up too much if you fail (gosh, Christianity should give you forgiveness to fail .... i suppose what i dislike most is the idea that we are born bad, and we must then live a whitewashed existence to make up for that ... i'd like to think that we are born with the capacity to fail and to be bad, and we will do both, and we *should* sin, and more importantly, we should learn from sin).
most of all, learn from your mistakes. and do better next time. and pass on what you've learned to others. but know that they have to fall in order to be saved, just like you did.