Please help!

I don't know how to cope. I used to cut myself when I felt like this. That was how I dealt with depression, with pain. I don't do that anymore, but now I don't know how to handle it. I try to focus on school and hang out with friends. Try to keep myself distracted, keep myself doing something fun or interesting. Try to laugh and smile. But it's always there in the background, tarnishing everything. And, as soon as I stop for a moment, I feel overwhelmed by it. I can't focus on my classes; it just hurts all the time. How do I make it stop? How do I make it go away?