Why do we feel this need to be close to parents?

Of course people will say "because it's your parents and they put you into the world" I understand that. But what if, like me, you are given worthless ones? Mine have failed miserably, and frankly since Im now a parent myself I really realise the extent of their bad job. They were violent to each other, my mother was an alcoholic. They lied about whom was my biological father for 16 years, allowing me to believe it was my sisters father when in actual fact it wasn't. Along with generally being non existent when it came to comforting..and even now after years they have the audacity to say "we have been good parents. Our consciences are clean. It's you that has a chip on your shoulder" my sister (having been brought up with her real dad in the house) has been obviously treated differently. She is one of them and at 22 years of age she has no social life. She spends her time with them and has no friends, like they have none either. I'm the bad one. I chose child care and I was told it was a worthless path to follow. They stopped talking to be for 3 years until I eventually moved to live with my grandad. My sister chose care home work and yet they are pleased. Now I'm left asking myself "why do I keep putting up with this? Why do they still make me feel guilty? Why am I no able to move on without them?" I live abroad now and once I stopped calling every week we speak once a month if that..