I've felt the exact same way you describe in this post, but instead of "black", insert "short", "ugly", or any number of excuses I can come up with for why I don't fit in, and people don't like me, and it's not fair, and it's everyone else's fault. Bullshit. People aren't friendly to you because as a severely depressed person, you're probably a real bummer to be around. You probably look awkward, uncomfortable, and generally unapproachable.
You need to stop blaming society for your isolation and start working on shifting your shitty perspective. Some things that have helped me immensely are exercise and mindfulness meditation. Talking about your feelings helps too - as long as the people listening aren't just going to co-sign and feed into the depressive, self-pitying garbage that you're spitting out.
P.S. Feel free to contact me if you want to change.