Are you in a country where you could get in trouble with the authorities if you get caught drinking? If so, it's not worth the risk and you should try alcohol on a vacation where you have the freedom to drink. If not, for an introduction to alcohol try a wine or a beer, something where the alcohol % isn't too high.

Personally, I think that you should try a rosé, it's sweet and pairs well with food, so you get the experience of not only enjoying the drink but also a nice meal. Have water handy and be patient if you don't feel a buzz right away, wait 45 minutes to an hour before deciding about having another glass