Due to my ethnicity, anyone more than the size of a soy sauce plate is considered overweight lol.
I am 4 foot 11 and have always been built like a tank I have never in my life been "skinny" or "slim"
I have also always had short hair especially after I grew it out in grade 9 to past my shoulders later on right before grade 12 prom I cut it all off into a punk-style pixie..
I am now 42 turning 43 i have a round face and a big head i had hair down to my mid back and just got it all chopped off into an anime-style pixie cut. Yes, it shows my round face but I do not care because long hair or short hair I was still chubby so why not be cooler in the summer with shorter hair

( well at least that is how I see it. Not all curvier women look butch with short hair that's not true. A hairstyle is like clothing it needs to suit your personality )
So by all means if you want to cut your hair so it's a bit easier to manage then by all means go for it