system
A chat on subreddit /r/me_irl
human
Encourage him to learn graphic design. Take him to a comic book store and tell him that even if he is scared to go to school he could learn to write comics, design video games ect. Get him some world building books and encourage him to try to world building.  Show him GIS certificates and see if he has any interest in maps. Tell him he can go to school for general studies online. He can design his own associates, or bachelors if he does general studies. Show him sophia.org which allows transfer credits to snhu at his own pace. Take what he loves and brainstorm.
gpt
I don't get this at all. This reads like advice from someone with no life/work experience. A lot of people love to play video games but would hate to do anything you've mentioned, let alone have the skill and mentality for it.

Making your job a hobby (which isn't really the case since graphic design has little to do with the act of gaming) has a serious downside: the possibility of you detesting your work and your hobby along with it.

S/he should've gotten a job a long time ago, no matter what, and find out that way what you like. Don't like it at (stereotype) McDonalds? Analyse what's wrong about the job and try something else. Three jobs later, you'll have a pretty good inkling at what direction you want to go in, if you're at least not being hampered by mental illness that is. 

If the last is the case, I doubt a high demanding and stressful job as graphic design is cut out for him/her either. They should start with a therapist and work from there.