i think it’s literally impossible to increase my vocal range

i’ve been practicing my singing for over a year now, and i have the same exact range, maybe a note higher. at my absolute max i can hit an A4, but barely and i can’t maintain it. i started at G4… im a 18 yr old male and my lowest note is a G2#. my voice doesn’t sound that deep though idk what i’m doing wrong. my goal is to be able to hit a high c with my chest voice, and comfortably sing in an A4 . maybe some people just physically can’t increase their range and i’m just sadly one of them i think…