Why can't people mind their own business ?

Isn't it weird that no matter how happy or good u were but still onesome's one random comment makes u soo restless and insecure again.. I have my insecurity and i am trying so much to survive with them or win over them and slowly maybe i am learning but still one some just comes and passes a comment and boom back to zero.. like seriously , we all know everyone has their own problem and struggles but still most of them just focus on others life more , intentionally or unintentionally point out their insecurity like its my height , my weight , my body u have nothing to do with it so why the *** are u obsessed with fixing me ??? why the *** u so focus on wheather i am doing exercise to inc my height or not ? am i going to gym to loose my weight or not? am i getting slim or not? or i am still that  short , fat ugly person .... and TBH its soo easy to say ignore people , or their words , have confidence in urself , love urself but how am i able to love myself when since i was born i was being compared to every one either about height , weight , skin, am i doing house chores or not? and i always fails in that comparision bcz i was never a proper fit ...for anyone ... wherever i go either a family function , a gathering , or even my own birthday .. not just my distant relatives but my own mom , brother , and some close relatives gives me advices how to inc ur height , or be slim , how do i have confidence when i go out and random neighbor or anyone just comments about my short height and says u should inc ur height or how u drive scooty ur legs are so small and noone not even my family protects me or takes my side and when i say something to them they be like we are talking for ur favour so u can inc ur height otherwise in future u will blame us for not pushing u enough for inc height .. i mean seriously??? ur work is not to make me feel insecure or unworthy or self concious but to love myself to accept myself the way i am but no they can't do this and now there i am even if i try soo much i can't love myself and just hates myself every part of my body every thing about myself ... and now when someone says or points out my insecurity i can't event able to take stand i just agrees with them like its my fault .. i don't maybe it was , maybe it wasn't but ok.. i mean is this soo difficult to mind your own business or understand which ur  " normal comment" can be someone's insecurity and can ruined their hours , days or even weeks ... I had a very bad day i had been having soo bad days from past few days getting anxiety attack , hurting myself , hating myself , restless always on edge and today i went out for shopping with my dad and finally felt little happy and like yehhh maybe i am feeling good or healing maybe .. but then my cousin brother called i had no energy talking to anyone he was talking with my brother but then he passed me phone so i talked with him and then after a while he started talking about my height .. " what about ur height now?" , " what u increased it?" , " Are u doing exercise to inc ur height?" , " u should do exercise to inc ur height , u look like a child , a 5 year old kid" ? and tbh my height is yess its smalll but not that much that i look like a 5 year old but yehhh i don't care .. but ofc it hurts and it hurts soo much and my mood ruined again and and i became restless and overwhelmed again and started bitting my hands again , avg reflex of me when i get restless and overwhelmed and now old bruises are not healed i get new one ..A growth right...