I am an introvert too. I dropped out of high school because of social anxiety and am ostracized from groups I meet in real life, but am better at socializing online. My husband just got over a depression that started last November. He stopped working and we almost lost everything because of it. I'm telling you all this because although your situation is different, I can relate to your pain.

Have you ever looked into finding a Ketamine treatment center for depression? Yes, the street drug Ketamine helps a high percentage of people with treatment resistant depression when given as infusions at a low dose. My psychiatrist said it's the fastest way to recover. There are clinics all over the US, maybe near where you live too, but it is expensive. We looked into it for my husband's depression but couldn't afford it. I encourage you to research it too.

Hope you find more successes here. <3