Having niche interests is hard

So, I've always found it hard to connect to many people over the course of my life because I find I have no common interests with them. They always talk about what's mainstream and what everyone else is doing, but then I try to talk about stuff I'm interested in - niche, almost obscure stuff as far as the mainstream goes, and nobody really cares.

It's kinda disheartening in a way. It doesn't really help that I often find whatever's mainstream to be kinda dumb and mindless.