Am I Retarded?

[lehighguy]

6-max fairly lose table, $600NL
Hero has $600

Hero is in CO with AK
Hero raises to $24, SB re-raises to $64, BB (moron) calls, hero calls

Flop: A,5,2 rainbow.
check, check, Hero bets $165, SB calls, BB folds.

Turn: nothing scary
Hero bets all-in $3xx, SB calls

SB shows AA

I'm in the middle of a vicous downswing (3.2k after that hand). I don't know if I've totally lost my ability to play or I'm just being paranoid here.