Much of what you learn about making art will come from doing it, but there is a great deal to be gained by having an audience (your classmates) and constructive feedback from your instructors. College is a special time to dedicate yourself to your pursuits and meet people that may become lifetime friends, and mentors. There are many art-related professions: graphic design, website design, illustration, art therapy, teaching, interior design, fabric design, museum work, etc that do require schooling and training.
It is wise to think about what you will do after you graduate. There is nothing to stop you from attempting to seek fine art venues for selling your work now, but you may still need another source of income until you are established. Perhaps you could consider a double major, in a field that would allow you to make good money part-time, while preserving dedicated time to pursue your passion and establish your art career. Art requires a steady and disciplined effort. Success doesn't typically happen overnight.
Think about a job that you could work at three days per week. Some medical professions schedule people in 12 hour shifts so that working three days per week is considered full time. There are many decisions for you to consider. As other people have mentioned, education is valuable and the opportunities it can offer cannot be underestimated. The job market is difficult and the reality is that higher education is also about networking, making connections, and being introduced to your future colleagues. Good luck!