I am mad at my gf for not opening up about her feelings.
Why do you think she is not opening up?
Perhaps because she doesn't actually like me
You shouldn't be quick with being upset at your girlfriend. Maybe she has a good reason to keep things from you.
No there are no reasons to not open up. She has to accept my ways or there will be a fight.
Have you talked to your girlfriend about how you want her to be more open with you? She might not realize what you want and not even know that you think she's withholding her feelings.