Depression and school

Ever since school started again, I've been even more depressed than usual. I cut myself at least 3 times a day and I haven't been able to stop. School is even worse since I'm in a new and bigger environment with harder classes and no true friends. There are some people I talk to at school, but not enough to consider them as my friends. I've been having suicidal thoughts more often because of my cutting. Every part of my body has been hurting more frequently to the point where I can barely even sit or walk because of it. My chest, head, stomach, hips, thighs, and feet have been hurting daily. My feet is the worst because I have flat feet and they face inwards due to me walking like that my entire life without correction, so it adds to the pain of my flat feet and I now have to get braces for my feet to correct them. I just want all of this to stop. I don't know what I did to deserve such a painful life..·´¯`(>▂<)´¯`·.