I'm going to break up with my gf because she kept pressuring me to tell my parents about us
What's so bad about your parents finding out you're in a relationship?
Yes, she really fucked up my life.
If you really feel like she messed your life up then you should probably not be with her. It makes sense that you do not want to tell your parents if you do not plan on being in the relationship for much longer. You are much better off ending things sooner than later.
I just want to hurt her.
It is not great to want to hurt her. Try focusing more on what would make you happy, instead of what would make her upset.