Where did I go wrong? (please I need feedback)

OK this was at our Poker Club tonight, it's a University club so no money is on the line, but it's taken relatively seriously by the members.

Early stages of NL Holdem tourney, blinds are 20/40; Hero (UTG), SB, and BB have relatively equal stacks at about 1500 and BB seems solid and slow played trips on the flop the hand before.

Hero is dealt 9 [img]/images/graemlins/heart.gif[/img] 9 [img]/images/graemlins/spade.gif[/img]

Hero calls (40), folds to SB, SB raises to 80, BB calls (40), hero calls 40 more

flop comes 3 [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/heart.gif[/img]3 [img]/images/graemlins/diamond.gif[/img]

SB bets 200, BB raises to 400, hero calls 400, SB calls 400

turn comes 10 [img]/images/graemlins/diamond.gif[/img]

SB checks, BB bets 200, Hero goes all in, SB folds, BB calls after thinking for a while and shows K 3...the river is a blank

was i right to push here?...i know it's early in the tournament, but the pot was by far the biggest at the table so far and i was pretty sure he wasnt calling without a 3 or a high pair...which i didnt think he had...am i just retarded?....and if so please say so...thanks.