I want to go home.
Why do you want to go home?
I am not having fun at this party.
If you are not enjoying your time at a party with others, it is perfectly fine to decide that you want to leave and go home. You do not have to remain at a party if you are feeling uncomfortable.
What if I don't have a ride? I don't feel like calling my parents.
If one of your friends cannot take you home, then you should call your parents. There is no reason to stay if you are not enjoying yourself.