50NL - time to burst my never fold AA bubble?

[Whisper]

The deep stack behind me was pretty donky, but the BB was pretty solid. If BB had pushed i would probebly insta call, but it really seems like 99 77?

Full Tilt Poker
$/$ No Limit Hold'em Ring Game
6 Players
LegoPoker Hand Converter

<font color="black">Stack Sizes</font>
SB: $15.9
BB: $116.55
UTG: $51.40
Hero (MP): $49.25
CO: $195.10
BTN: $66.85

<font color="black">Preflop:</font> A[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img] ($0, 6 players)
UTG calls $0.50, <font color="red">Hero raises to $2.25</font>, CO calls $2.25, BTN folds, SB folds, BB calls $1.75, UTG folds

<font color="black">Flop:</font> 2[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/heart.gif[/img] ($6.75, 3 players)
BB checks, <font color="red">Hero bets $5</font>, CO calls $5, BB calls $5

<font color="black">Turn:</font> 2[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/heart.gif[/img] [7[img]/images/graemlins/spade.gif[/img]] ($21.75, 3 players)
BB checks, Hero checks, <font color="red">CO bets $22.50</font>, BB calls $22.50, Hero folds