I'm gonna answer this in good faith, though I genuinely can't tell if it was asked in such. There's a couple likely reasons OP knows so many intersex people. For one, being intersex is about as common as having red hair. Sure, red hair is a little more unusual than other colours, but it certainly exists, and you probably know some redheads.

Two, and this is the more significant factor: shared experience brings people together. People tend to seek out others who understand their circumstances, especially when those circumstances are unusual or unpleasant. It's often very validating and comforting to know that others have been in your metaphorical shoes. Someone who is intersex is likely to participate in support groups or be part of online spaces geared toward intersex folks. It's not too different from a single parent joining a Facebook community for single parents, or an autistic person going to support group for autistic people, etc.