Why can’t some people understand that not everyone comes from a loving family?

Okay so one of my friends I met a year ago (we were getting to know each other) thought that I had am amazing family and well put together. She asked about my parents, but the truth is I don’t really talk to my parents anymore. My mom and mine relationship is broken. I don’t talk to her anymore because of a heated argument we had after my younger brothers passed away (she blames me for it), my was in prison for most of my life. My moms side of the family turned against me and my ex fiancé ’s siblings said I’m dead to them. My boyfriend then fiancé of five years dumped me because he couldn’t deal with me grieving and he was never there for me. He ignored me and didn’t even come to the memorial, neither did my mom or her side of the family. I’m so glad I didn’t marry him. I did NOTHING wrong. Me proposed to me two years ago, four months before my younger brothers died. I still had my good days and lived life. My sister is the only one that I speak too. My grandparents said something very nasty to us when we were kids and my mom back then cut off contact. My friend was shocked to hear all this. She said I seemed so positive, strong and doing good for myself and she was surprised that I have a messed up family. I explained to her that not everybody came from a good background or family and she needs to understand that.
my sister, my best friend and my best’s family has been more of a family to me than our real family has.

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My good friend kept encouraging me to talk to my mom and work things out but she wasn’t listening to me about the part that my mother refuses to speak to me and we had a heated fight later after my brothers died and my relationship with her got thrown out the door and that ship has sailed. She won’t stop encourage me, and I had to raise my voice to get her to hear me. She has one of those people that are expecting to be perfect, and jumps in to be a hero when they didn’t ask for help.
Why can’t some people understand that not everyone comes from a loving family?
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