How to get over resentment?

Especially to your own spouse, the unfair treatment which were given to ur late parents. I feel so unfair. When i voice out, mention i cant get over the past. Why must i bring out the past. But they dont understand. Resentment over how many times i tried to talk things out, i was the one who gave in, i was the one who needs to walk on eggshell everyday. Resentment over in laws too. It feels like i'm at fault for feeling the way i am. But i am so tired of feeling the way it is right now, and tired of how everything is only one sided. No one to rant to.