hey,
uni isn't everything, and you have definitely not failed in life. you still have time!
perhaps you'll do better than you think in your Alevels and get into UAL, but even if not...if you're not 100% sure about going to NTU, it might not be worth it. at the end of the day, it's £9k a year, so you want to really enjoy your experience. if it's just the reputation that is putting you off, you have a chance to prove people wrong! and at NTU there will definitely be people like you who aren't big on nightlife and clubbing. you can always find a likeminded circle of friends, wherever you go😊
what are your other choices on ucas? you can always also just take a gap year and reapply next year. but sometimes having to defer entry can make it all the more daunting when it finally rolls around.
you can absolutely get a good job without Alevels or a uni degree, though. most employers don't require anything past GCSE - they're normally more interested in your experience. of course, there are certain careers for which you do need a degree, but your options are not at all limited!
please try to relax and enjoy your long summer though!