I guess I was beat, but I need to improve my betting sizes or something, maybe I shouldnt of checked the turn? Opinions please. I think I buggered pretty much everything up this hand.

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Button ($25.60)
Hero (SB) ($38.50)
BB ($5)
UTG ($14.10)
MP ($11.30)
CO ($27)

Preflop: Hero is SB with A, A
1 fold, MP (poster) checks, CO bets $1.25, 1 fold, Hero raises to $2.25, 2 folds, CO calls $1

Flop: ($5) 7, J, 10 (2 players)
Hero bets $3, CO calls $3

Turn: ($11) A (2 players)
Hero checks, CO bets $7, Hero calls $7

River: ($25) 4 (2 players)
Hero checks, CO bets $14.75 (All-In), Hero folds

Total pot: $25 | Rake: $1.20