I totally get that feeling. I have no genetic illnesses that I know of, but be it nature or nurture I got dealt a losing combination from the outset. My mother is a very compassionate and emotionally intelligent person, while my father is less empathetic but very smart and logical.
I got the logical nature of my dad and the emotionality and empathy from my mom. That just left me very self-conscious, overthinking and overanalysing everything, picking up on the slightest social cues and blowing them out of proportion (i.e. "that person doesn't want to hang out rn, I guess he hates me").
I've always felt out of place as far back as first grade elementary school, like I was born into the wrong world, like I'm not supposed to be here.