I'm sorry how you are feeling. You will be okay. You should ask your professors if there is any way you can do to help you understand. I'm not in collage so I cant help you much. All I can say is to stick it out because you will regret not sticking it out in the end. My dad didn't go to collage and he really wishes that he did. P.S. don't cut yourself... it isn't helping you at all. Take deep breaths and maybe you can talk to your room mate. It also helps to talk to brothers, sisters, parents, etc. GOOD LUCK!!!