Meh, while I'm beating myself up... how bad is this on a scale of 1 to 10?

$1/$2 No Limit Holdem
PokerStars
6 players
Converted at weaktight.com

Stacks:
UTG ($96.30)
UTG+1 ($431.80)
CO ($211.10)
BTN ($314.55)
SB ($146.35)
Hero ($243.40)

Pre-flop: ($3, 6 players) Hero is BB
2 folds, CO raises to $7, 2 folds, Hero calls $5

Flop: ($15, 2 players)
Hero checks, CO bets $12, Hero calls $12

Turn: ($39, 2 players)
Hero checks, CO bets $28, Hero raises to $75, CO calls $47

River: ($189, 2 players)
Hero goes all-in $149.40