I’ve been drinking for 4 years and still gag when I drink spirits, advice?

I’m 21 have been drinking pretty regularly since I was 17. Typically I’d drink heavy about 1 day a week or more when going clubbing then I’m pretty much sober for the rest of the week except a couple pints. I’m a coeliac so I can’t drink beer and cider is a bit shit so I normally drink spirits but I’ve always struggled to not gag especially taking shots. A lot of nights ends with me being sick or badly hungover the next day, any advice? (Drinking less is not an option)