Now I remember why I quit college the 1st time!

I went back to school. I am so frustrated. I am trying my best and I am still not doing well. It's a good thing I am taking online classes because I burst into tears in the middle of a test today. I feel like such an idiot. I knew I wasn't a genius or anything, but I didn't think I was so dumb. I am so upset and  Ijust want to quit, but I can't. And even if I did I would have to hear how bad of a choice it was and how I'm never going to have a good career and blah blah blah! No one in my family ever finished college, most didn't even try, so why in the fuck is it such a bad thing that I can't do it!!!!!!!! I haven't happy since I started and I hate it! I don't know what to do!