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I see people do that daily too, I'm on the internet as well. My point is, I only grew up with my own interests to the extent that they were available, i.e. a good deal less than now.
I think there's still a huge amount of difference of opinion. The internet is awash with heated arguments.
Every generation has its own trends, its own style and slang. The internet spreads them faster, but they were always there. I wouldn't assume that young people sticking rigidly to these things is an indication of a growing lack of individuality. 
Adherence to norms (whether as part of an in-group or out-group) is what young people do. They're forming their support networks outside of their family units, and finding their place in the world. Acceptance means everything in this stage of life. When that wears off I'm sure they'll find that the internet is there to cater to every interest they could possibly have, and most will be more confident in their own identities.
or maybe we were never so unique and we are just now discovering it through the internet that allows us to find other like-minded people?
Hundreds of years ago, people would go through life only knowing others they'd met in person. This meant that most people would only be able to meet like a few hundred others in their life (unless you have some rare special job that took you traveling around the world). In that world, people would have all seemed unique as we'd all have met fewer people who were similar. >

This is giving me "we live in a simulation" conspiracy nutcase vibes >

Or r/im14andthisisdeep >

Lol I can tell why you think that way but also a lot of you are a lot older and got to grow up with your own interests. Me being younger simply indicates that I get to see daily how everyone seems to like the exact same thing and speak the exact same way. 
I am not hating on social media I love it there would be no way for me to connect otherwise but I also firmly believe its led to the younger kids i.e. us having no difference of opinion on anything at all.