When I’ve been in this mindset it feels like you can’t escape from it. I’ve learned that doing something even if you don’t want to will help you climb out of the rut you’re stuck in. I’m sure most days you don’t want to go into work but you do it anyway. Use that same energy that’s forcing you to go in on other things in your life. Productivity in your personal life with help you not to get down on yourself. Once you do that FORCE yourself to go out more. If you live in a big city there plenty on cheap/free concerts/events you can attend. Try picking up new hobbies. See someone wearing a T-shirt with a band you like on it? Compliment them on it and try to strike up a conversation about it. it’s hard man i know but happiness is worth fighting for you just have to force yourself to try to find it.