Haven't posted in a while, felt like I have been playing good. Would love some input on this hand. Am I betting incorrect amounts on the flop and turn? What about the river call?

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
8 players


Stack sizes:
UTG: $102.80
UTG+1: $49.55
MP1: $50
MP2: $49.25
Hero: $63.55
Button: $12.40
SB: $62.05
BB: $68.50

Pre-flop: (8 players) Hero is CO with
2 folds, MP1 calls, MP2 folds, Hero raises to $2, 3 folds, MP1 calls.

Flop: ($4.75, 2 players)
MP1 checks, Hero bets $2.75, MP1 calls.

Turn: ($10.25, 2 players)
MP1 checks, Hero bets $5, MP1 calls.

River: ($20.25, 2 players)
MP1 checks, Hero bets $9, MP1 raises to $22, Hero calls $13 (pot was $51.25).

Results:
Final pot: $64.25

Bet a bit larger on the flop.

Check behind on the turn because you're likely wa/wb with it being more likely you're behind.

Fold the river. Why are you calling a raise on the river against a rock? What could you possibly beat that he would raise? Not a boat.