Why is using your family normalized?

people in my life only want to talk , because I have something they want. It could be over a year and the first thing they do is ask a favor. Don't get me wrong, im happy to help but when its time to pay me back dont say "I don't have it "when u got new shoes on or when I need ur help u turn your back on me. My closest family has been cut off for that shit especially my parents cuz they ungrateful and don't appreciate me after all I put up with. I will not be used by anyone idgaf what their title is.
Why is using your family normalized?
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