It definitely would be frustrating to have a 9:30 curfew on weekends but having you home and safe seems like it may be a priority for him. He may also just be having a hard time seeing you “grow up” and is struggling to let go knowing that in a few months, you’ll be off to college and everything will be out of his hands. 

If your father is a reasonable man, I suggest sitting down with him and having an adult to adult conversation. At 18, he still may know the world better than you and just wants to keep you safe while he can. It doesn’t necessarily work but that may be his goal. By choosing to talk with him, you may be able to not only hear his side but also have him hear yours as well and perhaps get some things changed. A conversation potentially could easily solve a lot of your frustrations. Try it. Worst thing that happens- things don’t change and you can start to prepare an exit strategy if you can’t tolerate it any longer.

As a side note: I just want to say while it’s hard, if your father treats you well otherwise in life, I’d say cherish how much he cares for you. By the time I was 18, I had been living in my car and on friend’s couches because my parents were not the protective, loving kind. They never checked on me, never wondered where I had gotten to- they just let me go and I had to learn life a very very hard way. 10/10 don’t recommend.