Everyone else in my family was in Ravenclaw. But I wanted to be Sorted into Slytherin and I was. I mean you might be placed in Gryffindor even if you wanted to be in Slytherin but it matters what you want.

I mean you are your own person, not JUST Weasley Septimus or whatever the Headmistress will end up calling you.

And you're a pureblood