getting older idk

every time i tell someone this they just say "youre only 13/14/15/16, youre still young, relax" and it feels so useless because it doesnt help. i genuinely feel as though i am wasting my life completely. im already 16 and my life feels so empty because i (think?) am mentally unwell. it makes me miss out on so many things, intentionally. im gna be 18 then 20 then 25 and then my life will be over and ill have nothing to look back on. and its already 2026 and im turning 17 like huh. i hate this sm i wish somebody understood this feeling like i did. im also doing online school so it makes me miss out on regular school, which means missing out on normal high school memories. ive only attended 9th and 10th grade irl (high school wise) and 10th grade was the worst year of my life, whereas 9th was the best. and now ill never experience anything like that again. i wish time slowed down a bit so i can at least keep up. sigh.
also, happy new year!