Do I have to pay child support if I gave up parental rights to a relative?

Mom kicked me out at 16 and I lived in streets for 2 years. A brother & sister befrieded me took in but I had to give myself sexually in order to stay off the streets so I got pregnant by the girls brother even using protection. Mom some how found out. My son was born in 1997. I wanted to give him up for adoption because I did not want a baby nor had the means to take care of him but mom threatened my life if I gave him up. Growing up in an abusive & dysfunctional home I knew she would follow through on her threat. So I was forced to keep him. I tried to be a good mom but my mom made it difficult. I was very nieve being isolated my whole upbringing. So I gave up all parental rights 7 years ago to my sister and now she's trying to file for support. I haven't worked in a year due to health issues. Am I obligated to pay child support? At time of custody hearing I asked the judge and he said no. But I want to be sure. I don't reside in the state of NJ anymore where child is residing. Please help.