Adam,
You are scared of getting your certification and not med school?!
I think you are at the same place alot of 25 year olds are. I just had a conversation with a 25 year old friend and he is in the same predicament. He has NO idea what he wants to do with the rest of his life. He knows what he is capable of, but not sure which field to apply it to.
I think the fact that you know you want to be in the fitness field is a step ahead most people your age.
Send me a PM with your address, and I will send you a copy of my
book.