Joining the military?

I'm just going to start out by saying that I'm the most indecisive person that I know. For starters, I've been in college for two years now. I dropped out for a semester last year because my grades tanked and I worked full time. I'm back this semester but I'm not sure I want to stay. It's not doing anything for me. My grades are a lot better, but I don't have a direction to go in. And it's frustrating because all the things in life that I think I want to do need advanced training and college education.

I flirted with the Coast Guard for a while last year, and I wound up going to MEPS. I scored a 95 on the ASVAB and all I need to do for medical clearance is lose 10 lbs. But I started to change my mind and I no longer want to go into the Coast Guard anymore.

Recently I've been looking into the Airforce, and the medical jobs they offer. I like what I see. My only worry is that I'll end up jumping into this, and then regretting it days later after I sign the papers. What should I do? I have no direction and no one to talk to for advice.

The only thing I know for sure is that I don't want to follow my families advice and go to culinary school. I've worked in food service for five years, I'm done with it. But thats direction that my families ever given me, so they're obviously no help.