Lets say you were to drop art as a hobby and a subject completely, lets say your now 25 years old and havent gone to uni.
You would still be able to simply develop your art skills, make a portfolio, do a year long access course, and then you could just... use that qualification to go to university.
I appreciate this is a very random scenario, but thats the whole point... I can assure you now, no matter how your situation with your art gcse progresses, you really can still end up doing art forever and even go to university if thats what you perhaps want to do.
If you dont care about art anymore, ignore it and focus on your other suibjects.
For most college courses you what, need to pass maths, english lit? or is it english language, and like 2 other gcses.
If I could go back in time to year 7 I would probably fail subjects that arent crucial / I am non interested in on purpose.
Thats all you need to get into a college course, maths, english, and 2 other gcses. You can also fail both maths and english, pass 2 random gcses, and still get onto a level 3 college course and also have to do functional skills for maths and english at college. It feels like the end of the world right now for you, I promise you, everything will be okay. This is not the end of everything as you know it.
I am rambling but you get the point. This life is yours so scheme plan and plot to get where you need to be and do what you want to do bro