When I was a child I was happy when I was given an ice cream cone. Then I saw a kid with two ice cream cones and wondered why he got 2 but I got only 1. Envy - I made my happiness less than it was because someone else had more than I.
Pride, Greed, Lust, Envy, Gluttony, Wrath, Sloth... The "seven deadly sins".
They are the key to our happiness or lack thereof. Without them, we are happy and content. With them, we will never be satisfied.
We can bemoan our predicament as we see others enjoying, or the allusion of enjoying the drink, or we can just be happy with ourselves as we are without it.
We may get PO'd by beer commercials. Imagine how someone who lost their legs must feel every time they see a new sneaker commercial...