I was first depressed in high school and the depression came and went until my mid twenties. At that point it just came and stayed. I've had a number of suicide attempts and struggle with self-harm. I have no support system outside of a good therapist and excellent psychiatrist. I have no friends and my family is clueless about mental health and has no idea how to support me. So it's just me.
I've been depressed for years and have also been diagnosed with PTSD from two traumas that happened almost 10 years ago, anxiety disorder, and borderline personality disorder. I've recently started having psychotic symptoms, so I don't know how or if that will change my diagnoses.
I am a loner. Since childhood I've preferred being alone to being around people. Some people say this is isolating and is part of my depression, but even when I'm happy I want to be alone. So I think it is just part of my personality. When I'm not depressed I have friends who I talk to and meet with, but not often. When I'm depressed I don't have the energy or desire to keep up any friendships. Interpersonal relationships are hard for me.
I am on SSDI for my mental health problems. I was the exception and had a very easy time getting on it. If anyone wants to hear an example of how well the process can go, I'd be happy to share.