I'm going to a party when my mother didn't tell me yes or no
Does she have a good reason for not telling you yes?
I think she's scared that I'm leaving home without her
Regardless, you shouldn't disobey your mother under her roof. When you are old enough to move out then you can follow your own rules.
It's frustrating that I have to be home so much.
It makes sense that you are frustrated with being home so much, but the only thing you can do is talk with your mom and figure out how to earn your right to go out to parties like this. If she is not letting you go it is because she does not 100 percent trust you to make the right decisions yet.