I am 21 years old.......?

I haven't done too much with my life, when i was younger around 14 i started doing drugs & didn't care to much about school. So i started failing & got kicked out. i ended up graduating at a home school. when i turned 18 i decided to grow up & try to make something of myself i started going to a junior college took some automotive, audio & some criminal law classes. I don't really know what i wanna do with my life, ive been trying to figure it out but haven't had much luck. As of right now im doing some more automotive but i don't think being a tech or a mechanic is for me. i mean i like it as a hobby but nothing serous. Also just got a job counting inventory for stores like walmart, target etc. lately ive been thinking of joining the military if i cant seem to find something i wanna do with my life. I just don't know what direction to go to if you know what i mean? If anyone could give me any advice or i don't know something?