I wouldn't want to be paintballing at 2am dressed as a nurse for the following reasons:
a) That's way past my bedtime- I have the mental and physical stamina of a little old lady
b) I'm lazy
c) I don't see the point of the fancy dress, it's too much effort
d) I don't like mess- after being covered in paint you have to have a shower and it takes up valuable sleeping time
e) I would much rather watch telly, preferably with a nice cup of tea and a slice of cake
I never really felt I fitted in at uni. I went to a Women's Group and they seemed like the tea and cake kind, but I didn't like the whole "Women RULE THE WORLD!" thing.
Don't spend all of your time alone in your room though OP, for the following reasons:
a) It gets really lonely
b) If you're staying in halls then you'll become a recluse
c) It will drive you mad, especially when you hear people laughing and shouting through the thin walls and you're sitting there on your own
d) Those 4 walls...my god...those 4 walls...
e) Generally it's just unhealthy. But then I do think halls are unhealthy regardless, I would rather live in a shed.
I think that since you're 25 you won't be expected to do all these activities that 18 years love to do. Thing is, most Freshers will be up for it, so it will be madness for a few weeks before everything calms down a bit. You are going to be a mature student, so as Talya has said you can go to mature student meetings and other societies that may interest you if you want to meet people. I strongly believe that no-one should feel pushed into doing Freshers activities if they don't want to, but people tend not to pressurise anyway. So...just be yourself, don't feel pressurised and try not to care what other people think about how you live your life. It's up to you what you do and there is no right and wrong.