I always felt useless

I’m 26, I’ve always had a weak immune system and lots of stomach issues and I fainted a lot as a child and teen, I even coughed up a lot of blood before, my dad told me “that it look like something out of a horror movie” I tried getting my ged before I got very ill after a bad experience so doctors thought it was just in my head. My point is that I have never had a job before and everyone looks at me like I’m lazy and I should’ve contributed to society a long time ago, well that’s what my mother in law told me... i have ptsd, lots of anxiety and depression plus adhd so it’s even hard to focus on anything and sometimes I can’t even clean my room and I sleep a lot some days... I want to vent more but I’m afraid of being yelled at or make someone mad on here...