Why do people often think biracial/multiracial people are confused or conflicted about who they are?

I saw some post about someone being against interracial relationships and they mentioned the kids of those relationships will be confused and conflicted about who they are or where they belong.

I never felt that way. I've always been under the impression that I'm just me and I don't need to particularly fit anywhere specifically.

I don't think we feel out of place or confused until someone purposely makes us feel that way.