A childhood belief about family

I used to believe (and still do somewhere deep down!) that I was born an identical twin and that my twin is out there somewhere. I even theorised that maybe i was a twin but that the twin died in early pregnancy!! It was such a strong feeling that even now at 18 i still feel it and i occasionally bug my mom to ask if she ever had my twin and never told me!! (her answer is always no but i dont always believer her depending on what kind of day ive had and how stubborn i want to be!!) Ive finally settled on the idea its cause im a gemini and that they say geminis go through life looking for the yin to their yang only to find it within themselves. ive had to settle with this to save me from the looney bin but who knows maybe my identical twin is out their somewhere...........