<human>: I'm a [23m] studying engineering being supported by my parents until I graduate with my bachelors degree and my GF is [21f] taking her liberals in community college while working in the National Guard and a bistro by the beach.  

short summary:
I'm getting exhausted with always being the one to deal with my depressed gf.  The thing is she has no friends, doesn't try to make friends.

The problem is that she has no friends to hang out with, a shitty job that she hates, paying for college on her own, no car, and her parents don't help her with anything because their struggling on their own.  She tells me that she's depressed and I understand why, however she doesn't do anything about it.  She puts up such a big wall that I don't think she'll ever make friends.  I've been there for her since the beginning and I'm beginning to feel exhausted from always having to make her feel better because I'm the only person she vents to (no friends).  Lately we've been fighting a lot.  I feel our relationship is going downhill.  Theres only so much I can do for her.  I understand that it's my obligation to make her happy but I just want her to make herself happy for once and make friends.

Give me the gist of the text in a nutshell
<bot>: How do I deal with her because she doesn't have any friends to talk sense into her when I try to let her know that I'm exhausted with her depression?