It can be extremely difficult to work out careers, especially when your dreams conflict with what others are saying. I would suggest for now sticking out your current degree - it can give you the stability you need for now and give you the means to pursue art and illustrating courses and life later on.

Can you use art as a hobby for now? Join a few classes, meet like minded people? Even take a few elective courses as part of your degree (depending on what it is)? That way you are still getting to spend time doing what you love.