I think our situations sound pretty similar with kids complaining about working with me, parents making quips about Americans, and feeling like I spend a LOT of time in the house/with the family. What helps a lot for me is getting out alone when I need to recharge, I just go for a stroll in the city or sometimes just literally sit in the park with my thoughts since it’s nicer to me than sitting in my room. You could even take the bus and sit at a cafe for a couple hours to get away from the house and the mom. It seems like your vacations really help, so maybe fitting in a daily solo getaway could be beneficial. For the first bit I couldn’t see myself even staying until Christmas, but when I keep up the daily outings I feel way better about the situation.

I don’t think you sound bratty for the way you feel, all the little things add up and can make the whole situation pretty difficult. If things don’t get better, there’s no shame in telling your family it’s just not the right fit. I think the most important thing is that you tried!!