Is it bad that i don't know what to do with my life?

I'm 19 (I know I'm young but please save that whole, 'you have your whole life ahead of you') and since I can remember I don't know what to with my life. I don't know what I want. I don't even know what makes me happy. I try to take one day at a time but it's just been so insanely painfully repetitive, I'm just wasting my life away.  I don't really do anything besides school, but I've just been coasting it, one or two maybe three classes a term. I'm tired of going to school and wasting my days. I've just wanted to stop going to school but i don't have the heart to quit because my family really wants me to go (i'm the first in my family to go to college) but sadly it's just not what i want, at least not right now and for the life of me i can't seem to get them to understand it. I do want to go and finish college but not right now, but my family really doesn't understand. So, i'm stuck in school unhappy.  For a while I wanted to join the military, either the army or the air force, but my WHOLE family threated to disown me if i did, so i kinda let that go (i needed some of my parent's info to get a specific military occupation i wanted but they wouldn't give it so i didn't sign because the other jobs were crap).  I want a damn change in my life but i don't even know where to start. I don't know what to do. I'm to the point where I feel like i'm trapped in my own skin, i just want to rip off my skin and maybe hopefully then i'll feel so relief, but i know that's just my insanity speaking. I'm wasting away. I don't know what to do. I need help.