Continue to search for a job earnestly, if you do it half-hearted, you likely won't succeed. Eat healthy, do fitness, sport, whatever to lose weight.
To be honest, you sound like me when I was 18-22. I got out of this vicious circle by having the goal of getting a real life, not the pit of self-loathing and escapism my life had become.
Having a job and a real friend helped me get out of that.
And do some street violence if you feel lucky. But don't go unarmed.