not a personal insecurity, but if your short and insecure, weaponize it. for example, I'm 5'11, but if I'm near a couple and I'm taller then her boyfriend, I'll find a reason to state my height outlook

but ill lie. I'll say I'm 5'9, even tho I'm 5'11, then make an effort to coincidently walk realy close to them. so the girl will see me, hear me say 5'9, then see me stand next to her bf and tower atleast 3 inches taller.
if it's a tall bf, ill do the same and say 6'1, so their 6'2 looks like a lie.

then I'll make an offhand comment. "yeah it's like guys with dicks. they measure them just as well as their height."