I have been experiencing this exact problem off and on for the past several years, almost since I dropped out of college four years ago. I finally had enough and decided that the only thing left for me to try is to go back and see if having a schedule and obligations will make my old hobbies more interesting again. And if that doesn't work or it works better than expected, I can try getting a job again.
Without classes or a job, time just sort of blurs by for me. Everything gets so monotonous, and it slows my head down and makes me depressed and anxious.
It took me a long time to realize it but right now I have to agree with
>>16124 – long-term NEETdom is almost as tough a pill to swallow as society.