Second orbit at table. Villain has been raising preflop just about every other hands.

PokerStars No-Limit Hold'em, $0.10 BB (6 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

BB ($3.45)
UTG ($1.90)
MP ($14.20)
CO ($24.40)
Hero (Button) ($10)
SB ($10.05)

Preflop: Hero is Button with A, J
2 folds, CO bets $0.30, Hero raises to $1, 2 folds, CO calls $0.70

Flop: ($2.15) A, 3, 2 (2 players)
CO bets $1.50, Hero calls $1.50

Turn: ($5.15) 2 (2 players)
CO checks, Hero checks

River: ($5.15) 2 (2 players)
CO checks, Hero bets $1.50, CO raises to $4.50, Hero ???

I am running bad and second-guessing everything.