who has a sister child or knows any one who clearly has middle child syndrome

I am a middle child well now I am grown. I have a older sister and a younger sister which I am the middle. It was so hard to deal with I always feel left out,my two sisters always get the attention and poor me left behind and now I am grown I don't feel that way now but it seems that both of my sisters are behind I don't know why maybe my parent realized that I was left out

My brother has had it since we were kids. He has always craved attention and will do anything to get it!