BB is 22/14 and likes to 3-bet in position or re-steal from blinds

Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($26.50)
UTG ($7)
MP ($36.10)
CO ($20.30)
Button ($21.95)
Hero ($28.50)

Preflop: Hero is SB with A, Q.
4 folds, Hero raises to $1, BB raises to $3.5, Hero raises to $7.9, BB calls $4.40.

Flop: ($15.80) J, 9, 2 (2 players)
Hero bets $20.6 (All-In)

I did not know why I made this move with no draws. I don't think a 3/4 pot continuation bet would work. Spew at this level?