If you can’t cope, it’s better to leave now while you still can. I get home around the same time from my grammar sixth form so I know how you feel - but most of the schools near me are terrible and I’ve been doing this journey for 3 years, so I’m used to it. If it helps, there were still people joining/leaving my school this week (and we’re on half term now), so it shouldn’t be too late if you’re sure!