small or no boob gurlies.

I have been chubby and healthy when I was a kid, but after I hit my puberty somehow I became lean. but I'm healthy though , its just I'm lean that's all. and also I barely have any tits. I thought it would idk grow out? maybe as i age. I'm 20 rn , and I'm A cup.
the thing is I have no problem with my tits. i love them they way they r. less uncomfortable stares. and maybe not being much sexualized? well not sure abt that part. but my mother bought me these some kind of organic pills to grow out my tits? that sounds so sus. those pills I mean. I cant even catch my breathe. everyday my mother makes me eat all these foods or supplements to gain weight. which ofc I want to , but in a more subtle way. I dont want to grow out my tits at all. y do people think we r insecure abt it? I'm pretty comfortable abt my tits and my body.
y'all have any kind of lore though being small or big boobed? I'm kind of curious though.