Bad play??? I really regret this decision.

[dimitrix]

I was playin a $2dollar no limit tourney on poker stars... Blinds are 200/400. I have 9000 chips and im on the button with A7s. Chip leader with 30,000 chips bets and i call.
3 people see the flop. 374... First player checks, 2nd player bets 400, and i call. Turn is A. Giving me 2 pair. first player checks, 2nd playe checks .. I bet 1000...First player folds, 2nd calls. River is J Chip leader pushes me All-in 8400 chips... I call thinking he has J7 or some 2 pair... He shows Pocket JJ... to give him a set to my 2 pair.
Could i play this any different?