Am i the only one??

I am pre-T and for the past 2 years every time i speak, i feel like its not my real voice or that my voice doesnt sound like what i think it is in my head.

Like for example, i am in the bathroom and my mom calls me from downstairs, i then answer while i am looking at myself in the mirror, and i feel like its not my voice.

Its really strange because in my head, my voice sounds manlier and then when i speak it sounds WAY different.