Hey Jewels,
sorry you're having this problem. I'm with you - I don't understand why people say things that are hurtful/biting. But they do.
And it seems to me that this is becoming a "normal" thing. I've had "friends" do the same thing to me and I've felt as you do. At that point I cross them off my "friends" list because I feel life is too short to waste time with people who don't appreciate me. And as for people who talk behind my back, they're off my list too if they can't be mature enough to say things to my face.

Hang in there - there are other people in the world more worthwhile and you can find them.