Sounds like your parents might be like mine self absorbed (narscissists) mine never 'saw' me at all, never knew me, nor seemed to want to.
I didnt feel wanted or loved, sometimes I wondered------------------------------if I dissapeared woud they even notice?

I was fed and clothed but emotionally it was a desert, leaving me insecure and sad.
I have come to term with it now, accepted that they will never 'get it'.
It is a greiving process, greiving for parents that I never really had. Emotionally I am an orphan.

They are using you, but you have realised and identified the problem. Most people never manage this.
You can move on, that might mean not having much contact with them any more and making a new and better life for yourself.