10 Euro Trip Aces, Kicker problem

Im in the cutoff with A10s - raise 3x BB - button folds - SB around same stack (10000) and BB (around 12000) call (Blinds 100/200)

Flop comes QA5 (two clubs) - checked to me - bet 2000 - both smooth call.

Turn:A

Checked to me again - I push to get rid of the draw

SB folds immediately - BB thinks for AGES and then calls

he has AJo and knocks me out in 140th (50 ITM)

Did I play this wrong?

(Sorry I didnt use a hand convertor - I closed the window straight away out of frustration)