I should have layed down the straight flush

[TheWorm967]

I just lost this huge hand and I thought i would share it. I had just sat at the table when this happened so I had no reads. when the villian raises I put him on a pocket pair AA-TT, i call with my nines hoping to flop a set on a small board and break this guy, the rest as they say, is history.

PokerStars No-Limit Hold'em, $0.25 BB (9 handed) internettexasholdem.com

CO ($9.65)
Button ($24.90)
SB ($14.25)
BB ($28.50)
UTG ($25)
Hero ($24.75)
MP1 ($3.90)
MP2 ($14.75)
MP3 ($3.30)

Preflop: Hero is UTG+1 with 9[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/heart.gif[/img]. UTG posts a blind of $0.25.
UTG (poster) checks, Hero calls $0.25, <font color="#666666">1 fold</font>, <font color="#CC3333">MP2 raises to $1</font>, <font color="#666666">5 folds</font>, UTG folds, Hero calls $0.75.

Flop: ($2.60) T[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP2 bets $0.5</font>, Hero calls $0.50.

Turn: ($3.60) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, MP2 checks.

River: ($3.60) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $3</font>, <font color="#CC3333">MP2 raises to $13.25</font>, Hero calls $10.25.

Final Pot: $30.10

Results in white below: <font color="#FFFFFF">
Hero has 9c 9h (straight flush, king high).
MP2 has As Ah (straight flush, ace high).
Outcome: MP2 wins $30.10. </font>

The thing is, and no one would believe me is that I felt like he very well could have it, I just couldn't possibly bring myself to lay it down. Did I play this badly? Could I have avoided this fate? Is this lay down easier than it looks?