I feel so complicated. can someone please help me?

i don’t know what to do. ever since the beginning of freshman year, i have been actively altering my voice to sound nicer, because i hate my original voice. it’s not because i’m transgender—i’m a cis female but just despise my voice. i sound too masculine, i believe. and at school, it is how i talk on the regular—besides at home, in which i y’all normally. for some reason or other. but today is my birthday, and i had invited a friend over to celebrate. she is a friend from school, so i immediately begin to talk to her in my elevated voice. my grandma gives me surprised looks, and subtly hints questioning why i’m talking like that. a usual response. as the night progresses, we had a wonderful time, but all the while my grandmother was making jabs at my voice. i told her that’s how i talk at school. and i do. just now, she confronted me and said what i was doing was wrong and that i am intentionally lying to my friends and teachers. i explained to her why but all she did was tell me i’m on the wrong. am i in the wrong? am i really? i just want to elevate my voice to make myself suitable personally. is that really so wrong?? please help.