I recommend growing a skill. Work on something every day and become better at it each time. It will give you a sense of fulfillment. Lying around all day is very easy and comfortable but it's not fulfilling and that's why we don't feel good about ourselves if we do so. When I was in your shoes a lot of people told me to go on walks, that it would help. My personal experience was that it doesn't help, it just takes up time and delays you having to go home to your shitty life.
Pick up a skill, anon. Anything productive. This guy I know is really into carpentry, he can spend hours in his garage just building shit. Shelves, tables, whatever. You need to try new things and find something you enjoy doing.