Found out my friend is my stepsister

You know my family history is really crazy like I found out a few months ago. That three random strangersI follow on Instagram is actually my cousins who all live together and know my real mother who I never met and also live an hour away from me and I ironically, I found this out because I almost dated the boy cousin luckily that didn’t happen and ironically enough, the cousin who I almost dated, (which I did not know at the time we were cousins by the way) father dated my mother who I never met before so hah I guess me and my mom really do have something in common our types cough anyways skip a few months later my parents were really pushing me to become friends with this one girl and so was her family we both thought it was kind of weird bc we both agreed that our families never wanted us to become friends with someone so much before, but whatever we look past it and became friends and then by accident, she learned that we’re actually stepsister’s because my mother and her father cheated on our parents with each other and ran away together when we were babies and now have three kids so yeah that’s how I found out. I have a stepsister and that we also have other 3 step siblings