Body disproportion

Hi everyone. I was wondering why is it that one of my pecs are like twice as large as my other despite me not being a very active person or working on that side of my body. I also noticed that one side of my face looks fatter than the other (it tends to switch day to day for some weird reason, is it how I’m sleeping?) and my left side of my body is larger than my right in both upper and lower areas (my larger pec is on my right side and I’m also right-handed if that helps). Does anyone have any ideas as to why this might be? Thank you.