I don't think u realise how different art is as a subject compared to a hobby
I wud know since i did it at GCSE and one year at alevel, that 1 year of alevel put me off art to the point I stopped drawing at all for like 2 years (i actuslly know a lot of people this hapoened to)...ive only started again recent doing some little watercolour paintings for fun, but haven't picked up a pencil
Art as a course is not that fun, its stressful, so u shud seriously consider ur decision...plus if ur not thinking of using it for a career then I wud strongly advise u keep it as a hobby at home, its more fun that way
If u decide to do a course for art, I suggest it's 1 year so u can trial it and not waste time...watch some YouTube videos on people who are doing the course u want to do