Lyric discussion by Professor M 

Cover art for Feelin' Good lyrics by Pussycat Dolls, The

The song is by Anthony Newley and Leslie Bricusse -- it's from the musical "The Roar of the Greasepaint–the Smell of the Crowd". I actually prefer the song (when standing on its own) when it's given a more ironic reading -- the singer "in character" trying to convince themself that everything is going well...and not quite succeeding. The chord structure of the song makes it less suited to an upbeat reading.