My parents told me the same sort of things. "You showed no indication of being a boy," they said, "I mean, you were definitely a girl." They didn't know that people usually came out during puberty and not childhood; the media cherry picks those stories because people just eat those up.
It's pretty uncommon for kids to know they're trans and it's a coin flip on whether or not they stay trans during and after puberty. Kids are too young to see the full picture, usually, and knowing what's coming is very different to experiencing it.
There are no rules to being trans. Go see a therapist and follow what you feel and know. You might be trans, you might not be, but don't let other people outright tell you how you feel.