How to forgive?

I'm not good at it. I'm of the personality type that if you do something to me that if never do to you, bye Felicia. I don't want to be this way anymore. It has caused extreme isolation and in some situations, even self sabotage.

I'm on the verge of loosing another dear friend. I see other people that get pissed off with they're friends/family/partners, and they just say they forgave them and they move on.

How do you women do this? Someone please explain bc I don't know how. I don't wanna be alone forever and this is standing in my way.