villain is running 23/13 with 25% steal over 177 so I flat IP

Full Tilt No-Limit Hold'em, $1.00 BB (5 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

Hero (Button) ($148)
SB ($102.30)
BB ($64)
UTG ($224.80)
MP ($124.05)

Preflop: Hero is Button with Q, A
1 fold, MP bets $3.50, Hero calls $3.50, 2 folds

Flop: ($8.50) 9, 4, 2 (2 players)
MP bets $5, Hero calls $5

Turn: ($18.50) 6 (2 players)
MP checks, Hero bets $13, MP calls $13

River: ($44.50) K (2 players)
MP checks, Hero bets $38

I feel like when I bet the turn I'm committed to bet the river
should I be just checking the turn back and trying to show down?