Low self esteem, feelings of worthlessness, and lack of purpose

[RedgraveStorm]

I've dealt with depression, low-self esteem, and anxiety pretty much my entire life. A few years ago I started going to a therapist and was officially diagnosed with severe depression and social anxiety, and while I've made great strides in learning how to live with these, medicine helped too, I still struggle. Everyday I deal with being very self-critical, sometimes to the point of not being able to get anything done during the day. I've turned to writing as a means to express myself as well as to achieve a life-long dream that my anxiety prevented me from doing, and it has helped a great deal. Just having something to do in the day, I'm unemployed, gives me a great feeling of satisfaction and purpose.
Recently I came to the realization that I will probably always deal with depression, as even on my best days I still feel it lurking behind me, like a ghost in the mirror; but that realization actually gave me a sense of peace. If this is going to be my lifelong struggle, then I have proven I can fight it, and I shall continue to do so.