erm opinions needed

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

3bet larger preflop to like $3.75. Bet flop larger because his range is wide (since you 3bet so small) and he is likely to have flush draws, straight draws, pair + draw, and overpairs in his range. And I don't think there is any reason to check the turn. Just go ahead and bet turn.

yeah no reason to check turn but after you do I like a shove

No way am I checking the Turn.

I would suggest playing it more aggressive from PreFlop to Turn.

Flop > You make him pay if he wants to draw.
Turn > Make him pay even more. If he has the Flush at this point he calls or raises and you know where you stand.
If not you take it down right there.

Just my thoughts.

Good Luck with those pocket A's.

Cheers for that guys. Also do I over-bet the flop with community cards like that? then carry on with a larger bet on the turn?

bet pot on the flop because his range hits that flop hard