I have a problem with the taste of alcohol

Lets start by Saying that i am not old enough tò be drinking by the laws, but in my country in Europe guys of my Age start drinking at this Age ( of course only when the parents give us pemission). That day me and my friends had a barbecue and the home owner forgot tò buy alchol so i went to my home and i took two bottles of rum and three corona. One of the rum was a botte of Havana club wich has a very high grade and i had a big glass with my friend, Who all said that It was very strong but i did not find It strong It seemed light tò me than i tasted a beer and i found It tò strong. So the next week i asked my mom if i could have a glasse of bear, wich She responded yes, i tasted It and i finded very bitter. Then the same night i decided to drink more Havana club and i still found It like drinking water with lime, can someone help Is this Natural? I only drink once or maybie two times a year so il sure Is not beacuse i am and alcholich PS: Sorry for my english Is not my First language