Drinking makes me feel sick

I used to drink a lot, for around 4 years I’d drink pretty heavily, a lot of shots – pure vodka etc at a very young age. I’ve slowed down a bit and don’t really drink that much anymore. However, I’ve noticed when I do go out with friends and have 1-2 drinks, I can barely finish it or my stomach feels weird. I’ve also noticed alcohol doesn’t hit me the same anymore. There was a occasion where I drank around 5 drinks including 2 shots – I wasn’t drunk, not even tipsy but I threw up all night. Obviously, I know some people just have different tolerances to alcohol. But for me, I was fine for 4 years and now suddenly it’s different. I drank sex on the beach which is low percentage in alcohol and I still felt ill automatically after 4 sips which before, I could have 6 of them and I’d be fine.

Is this normal? I know the obvious solution is to not drink but I’m 19, my friends drink and I want to have a good time. I also personally want to drink but can’t seem to feel good when doing it anymore.

Is there anyone who dealt with something similar or know how to ease it or stop it?