Why do I have such a high tolerance?

Im very skinny, have adhd, dont drink alcohol very regularly and dont even properly hydrate myself enough on a day to day basis(I probably gotta improve on that front). But I have a very high alcohol tolerance. Why is that?

Everytime me and the lads go on a pub crawl or any orher drinking outing, they get drunk so so much faster than I do, and also get drunk for cheaper than I can. Makes it so much harder for me to enjoy these events because I end up feeling like a designated driver or some shit because of how sober I feel compared to them despite the fact I drank more than them.

Is there any drink or shit yall would suggest that would actually make me feel proper drunk fast so I could keep up?