I've heard that you can go to university early, and with those grades if you got accepted into a good university and you're studying something you really enjoy, then i think you should definitely apply. For most people the whole point of A Levels is to get the grades to go to university, so if you've already got them, there is no point in wasting your time (unless of course you want to broaden your knowledge and take more subjects haha)
Probably the only 'downside' to you going to university a year early would be that you won't be legally allowed to go to any clubs and drink, but if you have no interest in the social side of university then you should be fine.
Ps. I can't believe you've got As in those AS subjects, I did Maths last year and I found it really difficult haha