10 x BB All in or Fold

Hi all I have a query regarding all in or fold stratagy at 10X BB...

I was in a tourny yesterday (freeroll 1000 entrants) and we were down to the last 75 players (Top 50 Paid) Now I was sitting in 47th Place with T 15000 Blinds where at 750/1500 now at this stage it is suggested that if I'm going to play a hand I should be all in if I dont want to be all in I should fold (as Is my understanding)

I was UTG with pocket 9's so decided to push....folded round to big stack (T 35000) who called with AK and then folded to BB(short stack T 3500)who also called (pocket 9's also lmao)

Anyway to cut a long story short the Big stack caught an Ace on the turn and out I went....

Should this of been played differently or did I do the right thing ???

Or is there anytime you should deviate from the all in or fold tactic at 10x BB...

Your help would be much aprecihated <<<probably spelt wrong lol [img]/images/graemlins/grin.gif[/img]

Thank You Tom [img]/images/graemlins/wink.gif[/img]