I am a bad person, and I need help.

I am a bad person, and I need help.  I belittle those who I love.  If I care about a person I can't stop critiquing and criticizing them on every level.   I have absolutely no patience.  If I can do something faster I'll take over, without thinking about someone else's feelings. I don't know how to act to not risk jeopardizing the thing that means most in the whole world to me:  my boyfriend.