"Petulant (including negativistic features) Negativistic, impatient, restless, as well as stubborn, defiant, sullen, pessimistic, and resentful; easily slighted and quickly disillusioned."

This is the subtype described in Wiki. I am very much that, especially when talking about getting better. I've read about DBT and self-forgiveness and all that. It makes me sick. It makes me hate the whole idea of it. It sounds like hippy-jippy mumbo jumbo bs, that would never help me. This is what my petulance makes me feel about it. 

I get physically annoyed when people tell me "it gets better", "you just need to learn to be positive", all that optimistic encouraging stuff. I start resenting everything like that straight away. I start feeling boiling rage, it makes me despise the idea and the one talking, it makes me angry, and most of all it makes me feel like they are thinking I'm an idiot. I hate the idea of being optimistic about myself.

The thing is, I don't want to feel like this. I don't like it, it makes me ache physically and it's very toxic and tiring. To move forward, to learn to control my other emotions, I need to overcome my petulance, but I can't and I don't know how. Any advice? 