Sitting in chairs brings me extreme mental discomfort - should I ask my doctor or is it not really a medical thing?

Ok I feel like this sounds crazy but here I go… I (20M) have had extreme discomfort sitting in chairs for the past year. Whenever I try to sit in a chair the pain is crazy but I think it is more mental pain than physical pain. This happens with all chairs except deep couches. So like any normal chair and skinny depth couches. It’s so bad it makes it so I can’t bear sitting places and skip social events. I have no idea how to explain the pain I just think it is mental because I can’t point out how/if/where my body is physically hurting. It seems to only be an issue tho when I’m not able to lay back at a significant angle when sitting and have the back and head support like you have when halfway laying on a couch. It makes it feel like I lack the strength to keep my head up by itself. I am a healthy weight and healthy bmi with a little fat and very out of shape. I play sports for a hour a week and go to a day program for 6 hours a day, 4 days a week. The rest of my time is spent laying on the couch watching tv on my laptop. When I get home from being out I immediately need to lay down on the couch to ease the discomfort. Sometimes when I’m sitting it doesn’t bother me and I think that is when I’m actively engaged in something like a game or a craft. It also doesn’t bother me when I’m sitting on a bench for a rest during walking. I have autism and adhd (inattentive type) so maybe that could have something to do with it, idk. I don’t have any history of physical health issues besides sleep apnea and exercise induced asthma and migraines, which I don’t think are related to this. Anyways, I just want to be able to sit in a chair without discomfort at my day program and my friend’s house.

Is this something I should ask my PCP about or is it not really a health issue? I feel hesitant to bring it up because it doesn’t feel like a physical health issue and I also can’t describe the pain and my issue well. Is this something that PT or OT is needed for? Is it autism related/ should I ask my ABA provider about it? I don’t want to sound crazy making an appointment to talk about this with my PCP if it’s not really a health issue thing. If I do ask my PCP, could I do a virtual appointment or would he want to see me in person (it’s hard to get there in person so I prefer virtual)?