Barely legal eh? Yeah, try to go rent a car. Wait, you (usually) can't, because economically speaking you're not an adult until you're 25, apparently. And at least in some places you have to be 21 to buy boozahol and smokes or enter an *ahem* adult establishment.
It is odd; 18 is old enough to vote (in the US) for the president, but we don't trust you with important decisions like which beer to buy.
Anywho, raining on your parade aside, Happy Birthday!