I'm going to complain about staying with my gf's family in a private conversation
Why do you want to complain about staying with your girlfriend's family?
I'm going to be a good independent guy who thinks for himself.
It can be hard to stay with a significant others family, and understandable to not want too. That being said, make sure you do it at the right time and way to not hurt her feelings.
No can do. I went to my gf and told her I didn't like staying with her family even though I was grateful for their hospitality.
Honesty is best and will help your girlfriend to understand any tension that may be there when you are around her family.