Body won’t accept alcohol

I (22 m)drink a fair amount to pass the time when I’m bored, but lately my body won’t let me drink. I usually drink hard liquor, IPA’s and ect, but lately my body won’t let me drink liquor even after a week of being sober. I do love to go all out when I drink alone, but every time I try to drink hard liquor my body ends up trying to make me puke it up even with a chaser. I use to be able to drink whiskey no problem but now I can’t, and now I can’t drink anything without my body trying to reject it. I’m guessing this is a me problem which I understand. But how do I drink without my body thinking it’s gross (I have no health problems)