What is wrong with me?

[Jo]

I don't know what is wrong with me, and would appreciate some kind of help.

I started college in September, and ever since, I haven't been able to do much work. I just can't. I have changed, in that I don't fit in with the people I used to, and find them annoying. I lost a bunch of weight, and try to seek approval by getting likes on my profile pictures on Facebook. I started smoking, and I don't feel like anybody understands. I have tried making myself sick, and cut myself a few times.I want to be successful, but I can't manage to do anything. I used to cry loads, but recently I just don't care as much, and I don't feel normal.. does anyone understand what I am going through? xx
This is not a troll... There aren't many reasons for it.