"Happy"

The things that make me happy each have their own unique way of doing so.  Although I may say that two different things make me happy, they ways they make me feel are in no way alike.  There is the same general feeling of "happiness" as we call it, but the feeling differs so greatly for each that at times I wonder why we describe so many things simply as making us "happy." Why do we define so many feelings with on word and shove so many emotions into one category just because they are positive?  They are each different and if I had a word for the way each positive feeling made me feel, it would make me...happy.