Morgaine-ism #6:

"If you're going to feel guilty, don't do it.
If you do it, enjoy it and don't feel guilty."

Yes, it really is that simple. Choose wisely, act with passion, stand by your decisions. Guilt is absolutely useless. You learned from your action or you didn't. You grow or you die. If you did your best it's all you can do. If you did your worst, at least have the stones to do it up right.