Edibles are confusing

I read about people taking 100mg edibles or up to 1000mg, and I get high as hell anywhere over 5mg. I take a single 5mg edible and get pretty high. Some nights I’ll take another 5mg. When I first tried edibles, I handled 10mgs at once and didn’t have much issue. One time I had 20mgs in a night and it was one of the worst experiences of my life. I get nauseated and get incredibly on comfortable if I do over 7mg now. How is it possible people take so much? Do I just need to take a bigger dose and the sickness will pass? Or do other people really have such an insanely high tolerance that they feel only moderately high at large doses? Or am I just so sensitive that I could feel the same sensations at 5mg as someone else at 100mg+

Wrote this while high hope it makes sense