I have been where you are at, and so have many others. I remember driving back from school one time to go home at 10:30 (a three hour drive) in a panic and wanting to run my car into every bridge embankment with no will to keep going through it all.

It's a permanent solution to a temporary problem. I lost my good friends, and people close to you won't always understand, but I know at 21 I have a whole lot of life left and a whole lot of time to recover making a new life along the way. Three years seems like a long time, but in the whole time frame of life it is so minimal.