Nice to see other INTPs in here! And also like seeing you INFPs ;D. (P.S. INTP women are 1.3% of the population.)
*crack knuckles* MBTI is short of like Gender. No, not every girl is the same, not every boy is the same, and some well consider themselves neither boy nor girl. None the less we still have one. It's the same thing with personality types. You also have to remember this isn't defining our actual personality (despite the name), rather it defines our way of thinking. Like how most girls think alike, most ENFPs will think alike.
Now everyone to a point everyone uses all 8 functions, but the four that make up our type our are dominate ones/ones we prefer to use the most. So the percentage you see on the test is basically saying which functions you prefer to use, which is why to an extent you can actually change your type. I think in my early teens I might have been an INFJ/INFP and I still now relate to those types a lot. But I also relate to INTJ, ENTP, ISTP, etc. Think of it like this: Your MBTI type isn't a box, but rather a TARDIS and each person with that type has their own little room with their own things and you all agree to go on similar adventures together and do similar things. Sometimes you might end up in another TARDIS for a while, but overall you tend to stay in that one TARDIS of yours.
And yes, feel free to add another discussion in. ^.^ It's totally fine!