Your school might have a cross-town agreement with another college's ROTC program.  If not, investigate OTS (which is after graduation).

If you do not get a pilot slot, you would have to choose something else and fulfill your commitment in another job.  It's always good to have a back-up choice.

AFROTC is a commissioning program, NOT an enlistment program.  They are two completely different routes.  I suggest you do a little more research into the difference between officers and enlisted.