i don’t understand what happened with drinking

Hi so this might be really random but i’m 19F and i have just completely changed with drinking.

when i was 15-17 probably i could drink so much and i loved the taste, could shot vodka or shot anything without reaction, and could wake up the next day without a hangover every single time. I arguably got more drunk then than i do now and i never got a hangover.

I’ve recently turned 19 but for a little while now I absolutely hate the taste of any alcohol. Shots make me shiver and throw up, I hate spirits, the only drink that i sort of like is a sex on the beach but even that for some reason makes me shiver when i drink it. Also, even if i don’t get extremely drunk I will wake up the next day with an absolutely horrible hangover that lasts all day?

Does anyone know why? I’m only 19 so i didn’t think this should be a problem for me as older people always say stuff like oh i wish i could be in my 20s again or my age and drink and not get a hangover.

Also does anyone know why it started tasting horrible and making me feel sick?