I've become what I hate.
You sound upset. What did you do that you hate so much?
I don't want to get into it. I became what I hate and that's unforgivable.
You shouldn't judge yourself, or anyone too harshly, as almost all things can be forgiven.  If you don't like some aspect of yourself, you always have the power to change it into something that you don't hate.
My problem is that I still like myself even though I am evil.
If you actually feel that you are an evil person, then you need to actively make changes in how you behave. You need to try to be a better person and act more kindly toward other people. That way you will have a more fulfilling life with better relationships.