here in MX you can pretty much go into a bar and get drunk since age 15... obviously only in bad bars, but hey, i am 23 and i was required to get my ID in a bar (a fancy one) once, i didn´t knew if i had to feel flathered or insulted i did said "Oh, i dont have one but i can show you my ass and you can confirm i have enough hair to be over 18" he just laughed and sent me in haha. (not that i have a hairy ass mind you, but it was funny none the less) and before whenever i got asked for my ID i would just ignore them and keep walking, or act insulted
as for your problem, just ask your dad and tell him to confirm you have permission to buy the game