It’s not being alone that’s depressing. It’s what being alone implies about the world, IF you fill the silence with hate. IF you don’t like yourself very much at all, and tend to assume others share your hatred.
I can be in a relationship with anyone. Whether I ever get mentally healthy or not, I can snap my fingers tomorrow and I can have a girlfriend. There’s no trick in having a girlfriend, if that’s all you want. If you don’t even know who you are and all you know is that you want to be loved, you’ll try to be anyone you can be in order to get loved, so that you don’t have to be alone. Because when you’re alone, you’re with someone you don’t know. You’re with a shifty-eyed douchebag, a con artist.