Well, you will never know how they will decide unless you try.
Did your HS send out a notice during your junior and senior years? Perhaps someone at the school would know.
Did you ever apply for FA before? I believe that the forms ask if you have registered if you are male.
Did your parents not realize you needed to register? Do you have any brothers? If so, are they registered?
What happened when you tried to enlist in the military?
You can attend community college and pay for it yourself and then try for transfer merit scholarships.