female singer without a "girl" voice

basically my problem is as the title says, im female but I can never sound good in a "girl" voice. i'd like some advice or knowledge if anyone has any, ill share details below

im a highschooler with a 3 octave voice (as decided by my choir teacher). i can go decently high as a school-choir soprano, and low into alto/tenor. i usually switch between alto and tenor for class.

despite this all, when i sing girl parts, outside or in choir, i sound ridiculous. even if the notes arent all that high, i cant match the "tone" or whatever. kinda like an actual tenor trying to sing an alto part. i feel most comfortable singing tenor or low alto with a male tone. more rich sounds. its easier for me to mimic girl singers with rich voices, but still not as easy as a guy voice

i know i just info-dumped a bunch of crap but can anyone help me just... KNOW whats up? i dont get why i cant sound like other girls with pretty voices when i have the range for it