Don't worry about basic mma classes just attend the classes you can. They won't throw you at the sharks. Since, you're in college your university should have a boxing, judo or wrestling team. You should be able to join judo/boxing without issue. But you will not be allowed for wrestling. Ask the coach if you can train with the team.
there are mma fighters with a primary discipline that does well in MMA. And there are others who just trains MMA and does well. Up to you.