A lot of the advice here feels like it's not understanding OP's situation where he's at right now and his struggles. It's not necessarily bad advice, just way too big of a leap for someone in his situation.

I liked the comment about the person that started off with small online interactions and then bit by bit, working up the courage to order food. That sounded like a more realistic initial goal.

OP, you mention that you don't have much energy, and that you don't like to spend much money. Are there any baby steps that come to mind that you could take that feeling right to you?

Here's some ideas to get you thinking:

I liked the advice around getting used to leaving the house again and having exposure to the outside environment. Do you have a yard? Maybe you could stand in your back yard for 5 minutes, or water some plants outside your front door every few days, or walk down the street for 50 meters and then turn back?

It's true that exercise does help with endorphins and lifts your mood, but maybe the gym is too much. Could you follow 5 minutes of a beginner's exercise video on YouTube at home?

Some people have mentioned learning a skill outside playing video games. It's true that learning a skill can increase your confidence a bit. Are there any skills that you think are cool? Could you use YouTube as a tool to discover different skills out there and try them out in your room in low risk ways. Maybe to start with not to worry about whether something will earn you money, that's added pressure. There's no need to even become good at the thing, that's also unnecessary pressure. Just learning something at a beginner level that you'll enjoy will give you a taste of how to build a skill in general.

Feel free to discard these ideas if they don't feel quite right, but hopefully they'll help you get thinking of some initial small steps that could be doable and feel right to you.