I don't think you are in a good place mentally. It's up to you if you seek therapy to talk it out, or do some hard thinking and sort yourself out.
I used to be bullied in school, my grandpa told me to smack the bully on the end of the nose and this would stop them. I followed his advice and battered one of my bullies, I was only 10, I followed this advice again when I was 11 and punched a girl in the nose who had been bullying me. You can imagine how that turned out, was not fun at all getting punished for defending myself and it really annoyed me that there were strange double standards, a bully is a bully.
Now I'm like everyone else, I just think about punching bullies in the face, sometimes I even manage to verbally defend myself.
What I'm trying to say is that it's ok to sometimes want revenge or to hurt someone who you believe has hurt you, but it's another thing altogether to actually act on those thoughts. I find it's best to take some quiet time and think about these feelings when they arise, otherwise they just sit there, and mutate, and then you starting hating people, when it's far better to display indifference.
I know, what a load of rambling bollocks.
Don't give in to the hatred and bitterness, everyone feels it, the challenge is to defeat it.
Oh and don't hurt any girls, that is just wrong.