I feel like I want to vent to someone. I actually lowkey hate my girlfriend but don't wanna lose her at the same time.
Sounds quite complicated, are you sure this is the case? Why do you stay with your girlfriend if you hate her?
I'm a sensitive guy. I don't want to cut her out.
It's not a good idea to date someone you hate. Even if you think of yourself as sensitive, you are actually harming her and yourself by remaining in the relationship when you shouldn't end.
I'm just mad. I'll forget about this when I'm not mad anymore.
Hating someone at any time in your relationship might sound normal to you but it is not. Relationships do have a way of bouncing back and forth, and if that suits you then it's fine. Otherwise in the long run it happening too often will be miserable for you both.