Why not just write the whole thing out again? ... sacrificing readability to save paper is a bad idea...
That said, a D.C. will do the trick....just use some plain English "play repeats on D.C." to ensure your get your AABAAB....
you're only 16 --- take a chill pill. you're still a kid.
based on your lack of experience, it may turn out that this is not even what you want to do with your life - dont limit your options. I work as an engineer, but music is a hobby... I still get to enjoy it but don't have to stress about making it pay the bills.