Nervous and no body believes in me :(

I haven't even begun to start studying for the test because I'm too nervous about it. I'm scared that when I see how much I have to study, I'll give up altogether. I know it doesn't make sense because eventually, I have to face it, but if you guys could give me some sort of motivation, I can start. Currently, I have a low GPA (3.2), and everyone keeps making faces when I tell them I want to go to med school. I really have to get a 515, and I'm trying to do that on my first try. Could someone who isn't smart and is an average person like me tell me how you studied for the MCAT, in how many months or how many hours per week? I would really appreciate it. Have a great day, guys