I don't know anything about cognitive dissonance, but
@P12 wrote:
My experience is that I am an outsider in society and must act in order to fit in. The acting causes distress. I am not able to act naturally because when I have tried I have been subject to mistreatment, which causes greater distress.
...is something I can relate to very well. That used to be my life, except instead of distress, I think I would say more that the perpetual acting just wore down my spirits, to the point where I think by the end, I was probably really half-assing it.
Actually, to be fair, I don't think it was the acting itself that wore me down, as much as being trapped in an environment that was so alien to my own character that it necessitated me pretending to be someone I wasn't in order to appease others, if that makes sense? If I'd been in a community that I belonged to, basking in their presence would've been fulfilling for me, and me just being myself would've been fullfilling for them. If I'd been in the right community, there would've been no need to act. So my need to act was really just a symptom of the true problem, not the true problem itself. I hope I'm making sense.
And to make matters worse, because I couldn't truly understand what the people around me actually wanted from me, I suspect I wasn't acting the part correctly, hence they started being disrespectful towards me. So I was going through all that trouble for nothing.
Eventually, they seemed to just get tired of exploiting my desperation and left me alone. Not before defaming me as severely as they possible could, however. Aside from immediate family, that was basically the end of my human contact, so it's not a happy ending, unfortunately, even though the torment ended.
The truth is that very few of us are actually born into our home communities, so we need others to forge the inroads we need to enter our true community. And unfortunately, trying to bargain that assistance from those "others" is often a very tricky and sometimes hopeless prospect.
My point is that even if you are able to do an solid job of acting the part these other people want from you, there's no guarantee that that will be a road to what you ultimately want. So I think that's something to be cautious of.
However, in terms of improving your acting and lessening the psychological burden it places upon you, perhaps it might be helpful to single out a particular person, and try to base your performance upon them? I'm not suggesting you go around behaving as a carbon-copy of someone else, but I always found it helped to flesh out my performances when I had another established character to serve as a reference for the matters I wasn't clear on.