Hi DWR3,
Nobody is perfect. Your biggest problem is that you're too intelligent.
At your age you have 4/5 of your life infront of you. Ignore your own perceptions about your faults and health problems.
Your best course of action is to aim to be writer/ novelist. If English is not your first language; where did you learn to write so good?
If you can get some financial help, it is not too late to try for a university place. You will be famous one day!