Nothing wrong with a little bit of projection every now and then. It seems some people take it too far as a coping mechanism sometimes taking it to unhinged/unsafe degrees.

I consider it an ethical and moral responsibility to hide the darker aspects of my life from other people in general unless they are closely loved family or get paid to deal with such things as a career. If were just weekend night game buddies theres no reason you should be able to guess anything about my shitty life or internal suffering through poorly veiled character back story allusions. Its not your responsibility, its more personal that most are casually comfortable with, and its wrong for me to try to burden you with knowledge like that.

Revealing your deep traumas / "venting" to other regular people who only know you as a friend or passing aquanitence simply adds onto their psychological burden and likely makes further interaction weird or even secretly unwanted by complicating the relationship. Likely without improving your emotional situation any long term.