Worst ever....

Is it wrong to completely cut your family off from all contact. Im so tried of them throwing it in my face that i dont have kids. I use to be best friends with my sister. Untill we sold her a car and we have had trouble getting her to pay it off. It been over a year. And its always one story after another. But yet she just went on a vacation. Evertime i ask when shes gonna pay its always like you dont have kids so you dont know how hard it is. And just hurtful things. Well she only owes use a 100 now. And im meeting up with her to pick it up in a few days. After that im done. My older sister does the same thing. She has 3 kids and 2 she gave up for adoption without telling anyone. I was still in high school. So there was no way i could have taken care of them. Now she has a little girl that is almost one. And i was babysitting for her but i told her i had to charge her because it would take up my whole day. She agreed. It was only 20 dollars a day. Well i stopped because she stopped wanting to pay me. Plus i found out that where she was staying was infested with bed bugs. And i didnt want it brought into my home. We ended up having to treat the house because we found a few on our couch. Ugh gross worst fear ever. Anyways i told her about it and she just threw it in my face that i dont know what its like to raise a kid. Ps every dime she gave me i spent on my neice and the things she needed. I even ended up having her a month because my sister ended up homeless. I just find it so mean for them to keep saying that stuff to me when they know what i have been going threw with ttc. I have done everything i could for them. And this is how i get treated. I seriously have no one. I just want to walk away from everyone in my life. What do i do. Ignore it or walk away. Opinions please.