What is the song title or artist who sings a song with the lyrics
don't fear your worst friend, because your worst friend's just your
best friend that's done ya wrong,

Dear moxie1234-ga,

It is called ?Never too late? by Michael Franti of Spearhead on the
album ?Everyone Deserves Music?.

This is their web site. 
http://www.spearheadvibrations.com/index.html
http://www.spearheadvibrations.com/edm.html

The lyrics appear hear.
http://freakyandfree.com/lyrics.php?lyric=nevertoolate

You can hear a sample of the track on amazon.com
http://www.amazon.com/exec/obidos/tg/detail/-/B0000AQS0I/ref=pm_dp_ln_m_2/104-9680334-9845512?v=glance&s=music&vi=samples


Supporting references to the answer:

'Never too late'. This is already a classic to me. It is like I said
one of those songs that makes my flesh creep. I heard this song twice
live before and I was amazingly impressed by it. The lyrics are so
touching, I can't describe it actually, you should listen to it!!
Whenever you're down, listen to this song, it gives you strenght to
get on with your life. I'd like to thank Michael for that. The lyrics
are one of the most amazing ones I've ever heard, truely! The music to
the song is again really intense and gives again an extra dimension to
the lyrics. 'Don't fear your worst friend, cause a worst friend's just
a best friend who has don' you wrong!' Brilliant song.?
http://66.102.9.104/search?q=cache:QusRIrSlkjMJ:users.pandora.be/waveafterwave/EDMreview.htm+%22don%27t+fear+your+worst+friend%22&hl=en

http://www.getlyrical.com/bb/phpBB2/viewtopic.php?t=3865&sid=5277e1e543237938d27f30b3fedd2bec

http://www.reggaeontheriver.com/archive/review2003.htm


I hope this answers your question. If it does not, or the answer is
unclear, then please ask for clarification of this research before
rating the answer. I shall respond to the clarification request as
soon as I receive it.
Thank you
answerfinder


Search strategy
"fear your worst friend"
://www.google.co.uk/search?hl=en&q=%22fear+your+worst+friend%22&btnG=Search&meta=