Am i adjusting well or playing scared?

[ggbman]

Same 25/50 50 game, no read on villian. I have been playing aggressivley, i think people are taking notice. We're 4 or 5 handed, villian opens for 175 with AQ of spades, i call and the SB calls. The flop is 772 with 2 spades. SB checks, villian bets 450, i call, SB folds. Turn is an offsuit 3. Villian checks, i bet 1300, he pauses for a while and calls. River is a low brick, we both have about 4k left. In the party 2K games, i pot or shove this river most of the time, but i fear that players at this level might be more prone to making the tough river calls with 66, 88, 99, TT here. Villian checks, and i check behind. Good or scared?