Considering my father's gambling addiction, I never thought that I'd ever grow up to be a blackjack dealer. 
Wow. Interesting. The game is also called twenty-one, where on has to  compare card game between usually several players and a dealer
Nobody serious about the game calls it 21 though, except for maybe kids learning to count.
Since you are a dealer, you should already know that it's the most played casino banking game around the world. 
Yup.  In the dealer's course I took before starting work, that was one of the things that they told us the first day of class. 
Have you ever felt bad the days that you lost? since the objective of the game is for players to beat the dealer
Not at all! The casino owners know the game odds are in their favor, and when the players win, they're not winning my money, so it doesn't bother me one bit.
I am British but I know the rules in the united states is the dealer is also dealt two cards, normally one up (exposed) and one down (hidden). What's the rule where you come from?