Can I ask my girlfriend to have an abortion?
Why do you want her to have an abortion
I don't feel like I'm ready to be a father and she's not ready for it either.
This is a very personal choice that often has life long repercussion for women. If she's asked your opinion, be polite while you explain your reasons. Straight out asking or telling her to have an abortion is not acceptable, discussion on the topic is.
It's not like she will listen. She's already hating me and I don't know why.
It's possible she is feeling pressure about the pregnancy, and right now she needs your support. Start and open honest discussion and decide what to do together.