I'm upset at my boyfriend
Why does he upset you?
He's too embarrassing and he is not good enough for me.
It sounds like you are unhappy with your boyfriend and it is okay to feel upset. But you should talk things over with him to resolve your feelings and stop feeling upset.
Fuck you I'm in a bad mood and I'm going to destroy his life.
It can be really hurtful to make people you love feel bad. You should take time and try to help them if they are going through something difficult.