Of course, you can teach yourself anything and everything. Ad ultimum, Srinivasa Ramanujan have become a great mathematician without any formal training. Question is - you certain could learn on your own, but would you? For example, if the school was free, would you still go to school?
Good Lord... Newbie's mistakes all over the place. College is not about whatever it is they teach, it's about a piece of paper you can fall back on if things go sour. You don't have that. You say you started trading back in Feb., so basically you have a couple month's exp. and that's it. Trading takes YEARS to learn! Forums offer plenty of (piecemeal) info, but you really have to search to find gems. At least with a degree and some certification you could have had a stable job in the Finance industry to support you while your trading exp. grows. Going all-in on trading right off the bat is some hard learning as you now know. It's great that you believe that you can get by on your own, but that's hard living. Best of luck whatever the case. You're 20; plenty of time for choices.