Feeling lost on a gap year

Hi,
I'm feeling lost during my gap year, and it's severely affecting my mental health. I took a gap year because I wanted to pursue a degree apprenticeship, but I wasn't able to secure one for September. I also wasn't very keen on going to university, even though I achieved 152 UCAS points and got accepted into Russell Group universities.
Now, I'm feeling quite lost and depressed. I'm just so bored!
The only thing I do right now is work part-time at a bank, which I started in September. However, I don't think I can continue in customer service any longer. I feel like I can't relate to anyone at work since I'm so young and look like I'm 15, even though I'm 18. I often feel patronized by both my colleagues and customers.
I'm also discouraged about going to university because I don't have any friends. During college, I only had one friend, and they decided to pursue an apprenticeship.
I really regret not going to university and moving to a different city, especially since I'm from such a small town.
Does anyone have any advice on what I should do? I still haven't received any apprenticeship offers, and I'm feeling like giving up.

Have you got enough money to give up work and go backpacking or something similar?

Suggestions for a more productive gap-year :
Paid Work Internships Abroad: Find paid jobs through Gap 360
Camp America® USA Summer Jobs in America Since 1969 | Camp America
Or, if you stay in the UK, find another job - this one is clearly doing your head in.
Search for temporary or seasonal work on Job Search | Indeed
Or, if you decide to stick with what you are doing, find some online study to keep your head busy - look on FutureLearn, Coursera or Free short courses from the Open University | OpenLearn - Open University

Thank you for this!
It’s not the worst thing my job, buts I think that’s the fact it’s not what I would want to be doing long term, and that’s it part time which is driving me mad being stuck at home so much.
I only accepted it for the experience of working at a bank as I was wanting a finance apprenticeship, however i am just so lost as I still haven’t manage to get any offers.
I think it’s the fact, that I am comparing myself to everyone else who has got a degree apprenticeship or at uni.
I am only working part time, I feel awkward leaving my current role 5 months in as i am so new into the role, and they have spent money training me for the first month.
Also, I am worried about what to do as I haven’t got any degree apprenticeship offers, do I reapply to uni?, I am not sure what course?
Do you have any advice, and recommend anything else I can do in the meantime.