Speaking from personal experience running off and doing your own thing makes you feel more shit. Because you can’t escape yourself and you will be the only one in the hotel room, on the rides etc
With respect, that is only your experience and not fact. If the OP is feeling overwhelmed by the people around her then it's quite likely that spending a few days on her own is exactly what she needs to 'recalibrate' and then, I totally agree, she needs to find some non needy people to be with!
Learning I'm in my 40s but I've always taken time - from a day to a weekend - away from 'life' for myself whenever I've needed to.
I was also a mature student (26) when I was at university and I know exactly what you mean! I found a couple of mature students and non needy younger students to hang round with and kept away from the 'needy' people - you need firmer boundaries where they are concerned - you're not there mum or their older sibling and you're not there to help them with their work or life stuff. Some of them will have been used to their parents doing everything for them; they will take advantage if you let them.
I wouldn't go to a theme park for the weekend but then I've always hated them! But there is something quite comforting and reassuring about being surrounded by people enjoying themselves and not having to be part of any of it!
The restorative nature of the quiet headspace and time away from it all means that, when you return, you'll be better placed to take on other people's advice about making longer term changes.
I'm going away next weekend for a 'self care' weekend - I've booked myself into an inexpensive hotel and I'm just going to spend the weekend relaxing, reading, eating, drinking, walking, watching and being 'mindful'. I can't wait!