<human>: Can you condense the text into a few key points?

I do not know how to put this without coming across selfish or uncaring, but I must get this off of my chest. I do very much love my girlfriend and I care about her more than anything.

My girlfriend had always been warned about a family history of depression and I knew of her diagnosis when I got with her. However recently, things have been getting worse for her. I cannot pretend to understand what she is going through because I do not know the pain she has to deal with from day to day. Saying that, I always try to be there for her and do anything I possibly can for her. I am sure I am less than helpful sometimes but I assure you I try my very best.

But I cannot lie, it is hard on me and its changing how I feel. I hate how I am making this about me, I feel selfish and heartless for it. She isn't the same girl I use to know. We both recently turned 21 and were starting to enjoy going to bars together and just seeing what happens, but she now has nothing but distaste for it but I still love the idea. Of course this is just one example, but we are growing apart and we both know it. I find it hard to make her happy in day to day life and it is horrible to think I can't make her laugh like I used to. 

I don't know what to do, I feel like a wimp for not being able to get over this but I cannot deny the fact that I am not happy. Any help is much appreciated.
<bot>: Worsening depression of my gf is causing us to fall apart, we both know it and I feel selfish for being unhappy.