My twin and I are fraternal twins. Recently, we took a genetic test for fun, because we wanted to see what we shared and the differences between us. Since we still share genes, fraternal twins are like siblings genetically. My grandparents had suggested the tests and got them for us, so our parents didn’t know about it. But our results made no sense. My twin’s was coming up almost completely as Eastern European and Western European. Which makes sense, as most of my family are Croatian, German, or Austrian. So all of that would be accurate. But mine wasn’t anything like that. It was almost completely Scandinavian, with some Russian and a couple of other places. Neither of which were on my twin’s result, she had a very small percentage of Scandinavian but that was it. And we had no matched DNA. Which clearly seemed impossible. We were literally twins, we have to share DNA. 

My twin said they must have mixed my sample up with someone else. We ended up contacting the company, and my twin and I took a test again. It was the same result. Both my twin and I were really confused. We told our grandparents, and they just said that was interesting, and said nothing else. My twin said we should tell our parents, and see if they had ever done a genetic test, or if any of our siblings had, and then we could see if somehow ours were still right. I mean, it kind of made sense I'd have Scandinavian, because I'm much taller than my mother, and quite a bit taller than my twin and I'm way better at football and handball than she is. And I'm very blonde compared to the rest of my family, but I had thought it was the German. When we told our mother, they reacted almost the same way as my grandparents, but she seemed annoyed. And said that they're inaccurate anyway, and our grandparents shouldn't have told us to take one. And when we asked our father, he basically said nothing.

I'm confused. I know my twin thinks it's just a mistake, but I don't think so. We have to share DNA, about 50%. That's how twins and siblings work. Even though we're fraternal, we should still share quite a bit of DNA. But other explanations don't make sense. My mother can't have cheated on my father, because my twin and I would still share DNA. Just less, because we would have different fathers. The results mean we can't share a parent, or even be related. But I don't see why my parents would adopt me if I'm not their child, when I don't think they've ever been to Scandinavia and why they'd adopt a baby that's almost exactly the same age as their baby. I'm panicking. The person I'm closest with in the whole world, who I thought I even shared the womb with, might not even be related to me. My birthday might not even be real. None of this makes any sense, and no one is telling me the truth. I'm also scared my twin might tell her boyfriend about it, and then people might end up knowing that I'm some kind of fraud and my family isn't my family at all.

Edit: I called the clinic where my mother gave birth to all of my siblings. The day of my birthday, my mother is in the records but only for one birth. Not two, not twins. I don't know if it's an error, or my mother didn't give birth to me.