Do you really have a mental health issue if you're depressed for good valid reasons?

[jetenginejenn]

The gist of my life is that I'm 22 years old, have no friends, no family, no job, no education (with the exception of college that I just finished but got fired from the practicum and now may never get my diploma), live in the ghetto, use drugs and have had a truly terrible life. My boyfriend does drugs and deals them as well and yet lectures me on the same issues. He's also strangled me a few times.
In truth I must be a really bad person because I am almost universally disliked and ridiculed. I've tried so hard to be a good functioning human but most days I just want to die.
This is not a new thing, the story remains the same for the vast majority of my life. I feel that I am justified in thinking that I am not going to get better.
So, is this truly some form of mental health disorder or am I fully justified in wanting to die?
To those who said that I may hurt those that "love" me. Really, there's no one.