Dropping out of university immediately

I have applied for a three year course in Concept Art (FD) and start next week. I regret my choice more than anything for many reasons:
- concept art is a competitive field
- people value experience or a good portfolio more than a degree, you RARELY need a degree, while I am at uni I will not be working on my experience in the industry (though my work will further my portfolio)
- not even sure if I want that job anyway, in hindsight I'd rather do something physical
- I don't like being taught, I'm a very hard working and organised individual and spend ALL my spare time developing and refining my skills for work. I don't like a back-to-basics structure and want to jump in and develop at my own level and not the classes
- I wish I'd done fashion instead (my current university doesn't offer this) but considered myself a complete beginner so thought I would've looked a fool (But they would've taught me!!)
WHY have I done this. I hate myself for it. I at least could've picked a less niche degree because not even concept art jobs look for a concept art degree, let alone unrelated jobs. With the pressure of application deadlines coming up I decided to just do it, I literally did my application and submitted it minutes before the deadline. There were many other factors pushing me to do it but since then my life has changed a lot and I've had time to reflect.
I haven't started yet but I can't waste this time and I can't waste this money.
I REALLY need advice. I'm incredibly lost. Should I drop out? When should I drop out as to not doom myself financially paying it back and have some university funds if I want to go into fashion instead. I know I should do it in first year but how long can I try this out? I'm terrified and it all seems hopeless.