How do these children who become adults heal? It's this inner feeling of being a burden being rejected being a misfit

Have you seen in movies or tv there's a teenager who is quiet answers plain questions doesn't really talk and shuts everyone out mostly they live in the bedroom sneak out to grab food or use the bathroom go to work school. It's because they feel unwanted like no one cares what they have to say no one wants to spend time with them no one has spent time with them without it being forced and then they don't sit with the family to eat because they feel rejected

I don't know but for a long time I've felt out of place I thought I was adopted until I found my parents on my birth certificate. I was left home alone as a child and I felt neglected there was this huge ache to be liked I turned complacent I would do anything be well behaved to have someone anyone notice me. My mom used to leave me home alone and in the car alone while she would shop, I just had the tv while I was at home. It's like as a child all you want is someone to love you care for you spend time with you smile and listen to you someone to be there. It's all felt chaotic.

my mom calls everyone to eat at the dinner table except for me and it's made me feel hurt feel small feel bad, when I was seventeen I served myself and she grabbed the plate from me and said who do you think you are you are to be served last and that's when I knew that I didn't matter that's her opinion she wanted to serve me the scraps and smallest amount of food on me many times I was yelled at for not cleaning not cooking and many times I was alone my parents wouldn't talk to me they would laugh talk to each other but I felt neglected like imagine yourself if you were up in your room all day with no one to talk to it's abuse from parents I don't know but no one deserves this it's emotional abuse why have children if you just resent them for that don't get pregnant in the first place.