How do I stop doing the stuff I dislike about myself?

I see nothing wrong with what you mentioned except stealing. It's a decision you have to make. You look at yourself in the mirror and you decide, consciously, to change the bad things about yourself but opening accept your flaws. Realize what you don't like and every day try and make it through that day by not doing those things. Eventually, you won't have to try anymore. It will be natural.