Yea, as the youngest in my family growing by several years, I got pushed around a lot. I learned to put everyone else's needs before me and keep my mouth shut when something bothered me.
Now as an adult, I've grown out of some of that, but still find that I put others before me a lot and get resentful. There was also so much anger in my household beneath the surface I always feel like people are going to get PO'd with me over small things. Old family patterns still exist when I see them, so I like to avoid them.