>>7742852I am a twin that developed severe identity and social development problems because of this. From a very young age we didn't really socialize with other people, even as toddlers we had our own language. As we grew, we began to fight over friends to the point we both developed almost sociopathic abilities to steer social situations. (I was young, and even then didn't condone this, as it's a violation of my moral code but I had to learn to act defensively). Me and my twin are exactly identical but in highschool she started camwhoring on /b/ and people in the thread recognised her and said my name in that thread, many many years ago, so I flagged it as CP and got our IP banned. Now, I'm an adult with my own isp now, if you were wondering.
She's an overbearing person who is somehow both incredibly bossy but also constantly needs to be corrected and have guidance. Me, always being the more reserved and bitter/salty and "protector" of us two, developed a distain for identifying with anything feminine as an attempt go differentiate myself from her and vainity in general because whenever i managed to get any friends she would always find a way to wedge herself between me and any relationships I ever had with her bubbly nature and peacocking attitude. I became depressed and seen a psych, after being on SSRIs for 6 months I somehow came to the conclusion that I was a ftm transgender, and started taking testoserone. But that has long since stopped because after getting off the SSRIs I began to feel the need to have a family. I no longer talk to her but she aparently has fallen off the deep end with her impulsiveness and lack of foresight.
Many many developmental social issues between us two could have been resolved early if our parents fostered us to have healthy relationships with people in general, or it would have been more proper like others to develop socially in separate social groups. It isn't just sibling rivalry but being born into the reality of egodeath.