PokerStars No-Limit Hold'em, $0.25 BB (7 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($29.40)
MP1 ($36)
MP2 ($12.25)
Hero ($24.65)
Button ($30.75)
SB ($18.45)
BB ($11.50)

Preflop: Hero is CO with 4, 5.
2 folds, MP2 calls $0.25, Hero calls $0.25, Button calls $0.25, SB completes, BB checks.

Flop: ($1.25) 2, 3, T (5 players)
SB checks, BB checks, MP2 checks, Hero bets $1, Button calls $1, SB folds, BB folds, MP2 calls $1.

Turn: ($4.25) 3 (3 players)
MP2 checks, Hero bets $3.5, Button calls $3.50, MP2 folds.

River: ($11.25) Q (2 players)
Hero checks, Button bets $5, Hero calls $5.

Final Pot: $21.25

Villain unknown.

I've been burned by too many boats / big flushes on boards like these...am I being too nitty? Should I be betting the river here?