Can’t seem to get drunk any more. Advice?

I drink on occasion and not heavily. Also don’t get cravings nor any strong impulses to drink, so I’m pretty sure it’s not alcoholism.

Anyways. For my 18th I got very drunk and passed out. Ever since, I just can’t get drunk. I’ve always had a high tolerance but it’s gotten ridiculous. There’s been a few times I’ve downed six packs in a matter of minutes only to feel a bit tipsy. Whiskey doesn’t even work anymore, just gets me a bit buzzed even if I chug my flask.

I’ve always been quick to notice if I’m affected, and people around me usually can’t tell if I’ve been drinking, so I’m sure it’s not that I’m just not noticing.

I don’t know what to do at this point. My friends all think I’m trying to humble-brag about my tolerance if I ask for advice so I’m here. Seems like anything stronger than 40% is out of my price range, but anything in my price range doesn’t work. Absolute pain because I enjoy getting drunk with the lads.