I don't want to go to Disneyland with my family
Why don't you want to go to Disneyland?
My friends think I'll be miserable there.
While I think it's always good to go on family trips, it would be bad if you felt miserable the entire time. At the end of the day it's your decision to make.
But...
Sounds like you're having second thoughts about the trip. It's fun to try things you've never done before with your family.