I’m going to get science-y here.
The only things that make people truly unique are their genetic code and fingerprints. And even then, if you’re a twin (I think) your genetic code is the same as your other twin.
Otherwise, nobody is truly unique. We’re all like someone else, and that’s what makes me laugh about when people go ‘but I’m so different’ and then there’s literally hundreds of others who dress the same or like the same music or whatever.
Liking not-mainstream music and wearing heavy black liner doesn’t make you unique. Ask any recovering scene kid, we all thought we were so unique and in my friend group there were at least three of us.
Basically just be yourself but realise that there’s other people out there who are just like you. Which, if you think about it, is kind of reassuring. We’re not alone.