You're not stupid, but you care very much about having others' approval. That isn't a bad thing, glad you're open to advice.
You don't wish to look at any different universities, so you've already picked a first choice. Now think of backup plans in case things don't work out - not because UoB is not a good choice, but because you're being sensible in case expectations don't sync with reality. Even if you have your heart set on it, check around other schools and do more research about what people feel about X university and Y course.
Ask yourself what really matters to you in a university. Is it the people? Or the quality of education? Does it have lots of activities to keep you occupied and help you feel like an adult and in control of your destiny? Once you are aware of this you can make better comparisons.
I 'chose early' as well and am in Goldsmiths - of my 5 UCAS I put 3 applications to this school! While I am not heavily regretting it or resentful, I do wish I had been a little more careful and set my sights a bit higher or planned ahead for a career. But that's me and I'm not you - if you aren't a person to deliberate about what your talent and direction is, you've already made a very clear and sound decision.