I don't fit in at school..

I refuse to go back to school, hell I even want to just drop out at this point and get my GED so i can start working full time and get my own apartment to start my life. school is just putting me behind on the things that i want/need to do. school isn't for me. it never has been. I can't remember a day in my life where I was excited too go to school. Every morning I feel this intense fear about what's going to happen at school that day, my stomach gets upset and I feel sick every morning because of it. And when we pull up to the school, my heart races picks up and i get out of breath and then I worry some more. I'll walk to my classes thinking everyone I pass by is making fun of me or thinking rude thoughts about me. I'm a smart person, don't get me wrong, but I still have this fear that I'm not as smart as the other people in my class and it makes me want to shut down inside because I think I'm retarded. Which, honestly at the school I'm going to now, I pretty much know I'm smarter then a great majority of my classmates, but I can't seem to remember that in class. Then when I'm sitting down at my table or whatever, I cannot get relaxed at all. My nerves in my body will go off like non-stop. I can't focus in class, i worry about how I look, or what everyone else is thinking about me. Then at lunch I'll find a random place to sit by myself because I don't have any friends and try not to cry. Then after lunch I'm just worn out and all my energy has left me. I can't and don't want to focus during class. Everyone makes me mad. I don't feel like doing anything anymore because my tiredness plus the level of stress I'm going through is just way too much for me to handle. I seriously just want to drop out, school isn't for me.