I had a friend who had depression. Before that diagnosis came out, we were best friends. A lot of my classmates disliked him, because he was "scary", but I always protected him. Even though, it had the feeling we won't ever leave each other, it was all fake, an illusion. After he revealed his diagnosis, he changed and he didn't like me. I tried my best to get things back, but he went to an another school with new friends (I've seen it). I was heartbroken, but I know things can't stay as it is. We need to move on.
My message to you, @Sannu95 and other people with depression: I know depression can't go over, but we need to move on. Know that suicide isn't an option. If you feel alone or bad, try to seek out to other people. Sometimes you can expect help from the people you don't expect you would get from them. Maybe your old friends doesn't suit you anymore, but look on the other side, there will always be new friends to make. And sometimes telling your story will lighten your heart up. Just like I did, because that's the first time I've said this to anyone, just want to let you feel better.