AA. am i playing too passive?

I don't have stats on Utrecht Slim. I played a big pot with him earlier.
I raised in EP with AQ. He calls with AQ. flop comes Q76. pot is about 10. i bet 7. he raises to 17. other players in the hand fold. i raise to 31. he calls. turn is x. i check. he bets 20 into a pot of 70. i call. river is Q. i check. he bets allin for 45. i call. split pot. i don't need analysis on this hand. i did play it funny and i even think badly. he was surprisingly aggressive though. i thought he flopped a set.

Texas Hold'em $1-$1 NL (Real Money),

Seat 1: Hero ($108.50 in chips)
Seat 2: Utrecht Slim ($99.30 in chips)
Seat 3: totalbluesky ($96.30 in chips)
Seat 4: jabba7805 ($117.80 in chips)
Seat 5: ptidibla ($246.40 in chips)
Seat 6: J__D ($98.50 in chips)
Seat 7: V Lenin ($117.50 in chips)
Seat 8: slipu ($10.50 in chips)
Seat 9: alex6M ($58.50 in chips)
Seat 10: Tabletopx ($96.80 in chips)



ANTES/BLINDS
alex6M posts blind ($0.50), Tabletopx posts blind ($1).

PRE-FLOP
Hero bets $3.50, Utrecht Slim calls $3.50, totalbluesky folds, jabba7805 folds, ptidibla folds, J__D calls $3.50, V Lenin calls $3.50, slipu folds, alex6M folds, Tabletopx folds.

FLOP [board cards 7D,4C,9D ]
Hero bets $11, Utrecht Slim calls $11, J__D folds, V Lenin folds.

TURN [board cards 7D,4C,9D,2H ]
Hero checks, Utrecht Slim bets $20, Hero calls $20.

RIVER [board cards 7D,4C,9D,2H,7C ]
Hero checks, Utrecht Slim checks.

SHOWDOWN
Hero shows [ AS,AC ]
Utrecht Slim mucks cards [ QC,QS ]
Hero wins $75.50.



SUMMARY
Dealer: slipu
Pot: $77.50, (including rake: $2)
Hero, bets $34.50, collects $75.50, net $41
Utrecht Slim, loses $34.50
totalbluesky, loses $0
jabba7805, loses $0
ptidibla, loses $0
J__D, loses $3.50
V Lenin, loses $3.50
slipu, loses $0
alex6M, loses $0.50
Tabletopx, loses $1
Should I be betting the turn? I'm a bit paranoid about everyone always having a set. So I check the turn to keep the pot small. I also give him the opporunity to bet with worse hands than mine. 4 handed after a call on that flop he must have a fairly decent hand. I thought most likely he has a set. Possibly A9. But the pf call with A9 is a bit loose. I bet pf the hand before too and took down the pot without a showdown postflop so maybe he thought I was playing loose/aggro.
I thought he would probably 3 bet me pf with JJ+ but maybe not AK.

What do you think?

Loads of aggressive and sometimes loose play going on at these tables

possible bet river folding to a raise, or else your line is fine.