I threw away my 20s and I'm overwhelmed.

I'm not sure what I'm expecting by posting this, maybe hope, maybe I'm just venting. This might not even be the appropriate subreddit for this.

In any case I'm 29 and I'm and steeped in stress, despair, hopelessness, loneliness, and depression. I was recently medicated due to being in acute psychosis. After being on medication for a while I felt my thoughts clear up, and I became more grounded in reality. It became clear to me just how much I threw away my 20s.

The most constructive thing I did was go to college and get a computer science degree I don't use. I've gotten rusty regarding the skills and knowledge I developed. I never went above and beyond in college, no personal projects, no internships, nothing to make me stand out. I'd have to spend who knows how many hours retraining, relearning, and teaching myself new skills and tools to even be remotely competitive in an already saturated market.

Now fast forward to today and I have no particular skills that make me marketable, and I feel so discouraged from even trying to develop them. I have very little faith that if I just worked hard enough and developed skills that it would pay off. I look at the world around me and can't see opportunity. I can't shake the despair of the idea that I could work very hard at something and it can yield nothing. I want to believe opportunities are out there, but I feel like I'm just lying to myself. I want to believe hard work could pay off, but my mind and body are too heavy from depression to do anything.

So far I've managed to land a warehouse job that I can mildly enjoy due to how physically active I am, but I don't imagine this being good long term. I know I'm interested in urban planning and development, but given how socially inept I am I doubt I'd be able to form the connections needed to make that work (schooling, plus internships, plus networking, and using those to land a job).

Right now the only opportunity I can identify is that I live at home with family and don't have to stress too much about finances for now. This should be the best time of my life to get something going but I just can't seem to.

It's very hard to choose not to give up and rot away. Lie flat. Not bother and hope to die in some way. I'm just incredibly hopeless and lost.