Birth siblings know-now what

I recently discovered that I had been lied to all my life and that my birth mom was the woman I knew as my much older (22 years) half sister. Thing was, I barely knew her as a sister. I was raised by her mom, my biological grandmother, although I thought she was my mom. Confused? Me too. Anyway, I knew my "sister" (actually birth mom) had 7 kids. We had contact for a limited time when we (her children and I )were kds. Of course I thought they were my nieces and nephews and they thought the same. My oldest "niece" (biological half sister) is only 14 months younger than me. I had re-established contact with them thinking I was their Aunt, and only just told them the truth last Friday. They had no idea either, although they had apprently been told I was adopted, something I was lied to about. But they had no idea their mother was my birth mom. I told the oldest only and let her tell the rest. Since then I have only heard from two of the other girls. Complete silence from the rest. Thing is, having followed them a bit on Facebook, I see that it is definitely nurture not nature that determines who we are. Although the man that raised me was not biologically related to me in any way (my birth grandmother's second husband, not my birth grandfather), he had more influence on me than anyone, clearly. There is really only one of the girls that I can imagine having any kind of a friendship with. She is one that reached out to me and was very kind. She is a professional woman, and we seem to have at least something in common. Honestly most of the others strike me as very, very different. I find their political views, which they post about a lot, downright offensive. I don't really post my political views because my employer would frown on it, but it is safe to say we would not agree on anything. I have many conservative friends, where I lean toward liberal, so that is not a prerequisite for friendship. However these people are violently conservative. They make offensive, even racist statements that are against everything I have ever believed in. I always wanted sisters, but I really don't see any real relationship forming here. I think they are rather upset about finding out their sainted mother never told them about her first born. I was also asked by the oldest about my birth father. As I told her, I have spoken to the man listed on my BC. He does not deny that he could be my father, but swears he has no memory of my birth mother. I don't think that sat well with the daughter, but that is what he said. My birth mother died last year, so I cannot confront her about the lies, which is what I would really like to do. I have also since figured out that my birth mother was pregnant with her oldest daughter 5 months after I was born and it seems it worked out better for her that time because she married her father 2 months after that. If I can do the math, I am sure the daughters can too, and they may be coming to terms with the same picture I have. I think she wanted to snag a husband. Didn't work the first time, did the second. This was the 1950's so it worked better back then! Anyway, my only point of this would be be careful what you wish for. While I always wanted sisters, it's true what they say about not being able to pick your family. When I first found out about this big lie I felt angry that I had missed out on the big, happy family and they do, indeed appear to be a close knit bunch. But frankly, my dad is the man that raised me, as I now know without a single biological connection, taught me about hard work, integrity and standing up for anyone or anything that was wronged. Taught me compassion for people with fewer opportunities instead of teaching me to hate everyone that was "different" from me and also taught me, even back in the 50's and 60's when I was growing up that being a mother might be part of my life but it did not need to be all that I was ever able to accomplish. My birth mother tossing me away like day old trash to be raised by a mother she hated, wasn't actually the wrong choice, at least not for me. I am still angry that I was lied to even as an adult, and specifically by my birth mom only a few years ago when I specifically asked her if there was any chance I was adopted (that after tracking her down via the internet). I do get it, though. Her kids think she was this great, loving mom, so how could she spring on them all of a sudden that not only had she dumped her first born, but she never even stayed in touch even though she had the perfect "cover" as the older half sister. Instead for over 30 years she had no idea where I was, what I was, or if I was even alive. Yeah, that still bugs me. Maybe it always will. But, logically I am happy with the person I became.