What am I supposed to do?

I'm friends with a girl who I really like. Last summer, we were both on a school trip. We developed a relationship on the trip. On the long bus ride home, we sat next to each other and well, I wouldn't call it cuddling but all she did was put her head on my shoulder and hold my hand.
After that, during summer, she told me she wanted to take a pause and resume a relationship after summer.
Fast forward to now. Were in the same block of classes, and were friends, but there's been no mention of a romantic relationship. She's even been telling me about guys she's liked (she's gone through liking about 4 guys in 1 semester)
And now, even more recently, she absolutely hates me. Any time I talk around her she yells at me to shut up. I can't tell if it's a joke or not because she just seems normal after a while and talks to me like nothing's happened.
After a while I've started to realize that it's probably my fault, not engaging or making a move on her, and being too shy about all of that.
So what do I do? Should I just give up? I really like this girl.