my left arm if bigger than my right?

Question

i used to be a self harmer and the arm that is bigger (muscular)
is the arm that i cut the most on does that have anything to
do with why that arms bigger
or does this happen cuz the body doesnt grow at the same pace
also i right with my left hand
and everythign else i do with the
right like throw,anc catch
and other thing

well i am 13

well i am 13

Answer 1

not many people are perfectly symmetrical. for the majority of us one muscle on one side is always slightly larger than the other side. it's the way human genetics works

Answer 2

well it depends on your age, some people do grow at different rates at different points in their body (which is the reason why so many people tend to be clumsy during adolescence, their legs or other body parts are slightly off from each other)

also doing a lot of activity with one arm more than the other (writing, sports, etc. might cause some of the difference in size)