Nobody likes to be told that what they're doing is wrong, except for me.
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You'll learn who your friends are. You'll learn that some people think they're being your friend when they allow you to wallow in ignorance, unwittingly propping yourself up to be knocked down harder. They didn't do this to hurt you; they thought they were doing what was best for themselves.
Don't be afraid to banish people.
Your friends are the ones who will be the messenger, who will allow you to hate them for a little while, who aren't afraid to wait for you to redirect your anger from those who have hurt you. They'll be your scapegoat, and they know you'll come around.
You'll decide what kind of friend you are based on these experiences. If you want the kind of friend who will inform you, gently or otherwise, that your actions go against your character, then you need to be that kind of friend.
If you want to be abandoned, abandon.
If you want to be loved, love (or learn how to fake it really well).
Be the kind of person you want to be with, and you'll never be lonely, but you may be temporarily loathed.