Answer by taking a quote from the following article:

"My Happiness" is a song by Australian rock band Powderfinger. It was released on record label Universal Music Australia on 21 August 2000 as the first single from the band's fourth album, Odyssey Number Five. The single is Powderfinger's most successful; it peaked at number four on the Australian ARIA Singles Chart, and charted in the United States on the Hot Modern Rock Tracks chart--the first Powderfinger song to do so. Powderfinger frontman Bernard Fanning wrote the lyrics for "My Happiness" as a reflection on the time the band spent touring to promote their work, and the loneliness that came as a result.

If you can't cop a bit of emotional stuff then you should go and get the lamp shade extracted from your arse. If you don't think there is enough rock in your life then let me know and I will personally come around to your house and chuck stones at you.  --Bernard FanningIn response to "My Happiness" being described by fans as "like Lauryn Hill, bland and boring Top 40 bullshit".  The lyrics for "My Happiness" were written by Bernard Fanning, Powderfinger's lead singer and songwriter. The rest of the band are co-credited with Fanning for composing the track. The song describes feelings of love and separation; Sain's Pennie Dennison said it described "the pining feeling you experience when you spend time away from the one you love". Fanning called it "a sad story of touring and the absence loneliness that comes with it". The extensive time spent touring took its toll on the band, and it was on the back of this that Fanning wrote "My Happiness". Thus, he expressed confusion at its being considered a romantic song.  "My Happiness" was attacked by some fans as being "like Lauryn Hill, bland and boring Top 40 bullshit"; guitarist Ian Haug rebutted by pointing out that the song was an example of the new emotional level on which Powderfinger made music, while Fanning was more aggressive in his defence of the song. In response to being dubbed "Mr Miserable" by The Sun-Herald's Peter Holmes for the lyrics of "My Happiness" and "These Days", Fanning pointed out that the songs could be construed either as melancholy, or as part of "the most hopeful record ... in a long time".  Much of Fanning's writing is inspired by non-rock music, and "My Happiness" is no exception. Gospel and soul music that is "unashamedly about love and how good it makes you feel" was common during the Odyssey Number Five recording sessions. Powderfinger worked hard in those sessions to ensure a more polished work than Internationalist; guitarist Darren Middleton concluded that "My Happiness", "The Metre", and "Up & Down & Back Again" were more "complete" because of the band's efforts. The lighter elements of "My Happiness" in comparison to some of the band's earlier work saw Fanning reveal his passion for several other musicians, such as James Taylor--something that "five years ago ... would have been an embarrassing thing to say".

what was my happiness about?
The song describes feelings of love and separation;