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i'm pretty much the same
there is acually some people i hate and cant stand being around them
mostly those guys who like to bully everyone that looks weak and get into alot of fights with them because i cant stand watching them bullying people becaue they are weak or different.
there is alot of people who did bad things for me and i was always that nice guy who forgive everyone for everything (thats what my friends told me)
for me i can only hate a person for a week(max) and then i feel normal with him again(well except if he is an extremly god level at being a dick).

the point is: forgiving people is not a problem or something sooo unusual
its good and people(worthly people to be exact) will like you and increase they're ability to ignore the bad things about you.
just know someone's worth and when you have no choice but to hate him