AQ can I fold here?

[AtotheG]

Fold/Call here? Does the player to act behind me change things? Was my bet on the flop the right size?

Poker Stars, $30 + $3 NL Hold'em Tournament, 25/50 Blinds, 8 Players
LeggoPoker.com - Hand History Converter

UTG: 2,855
Hero (UTG+1): 2,945
MP1: 3,085
MP2: 2,850
CO: 2,930
BTN: 3,220
SB: 2,990
BB: 2,550

Pre-Flop: (75) Qh Ah dealt to Hero (UTG+1)
UTG folds, Hero raises to 150, 3 folds, CO calls 150, BTN calls 150, SB calls 125, BB calls 100

Flop: (750) Qc 7s As (5 Players)
SB checks, BB checks, Hero bets 450, CO calls 450, 2 folds, BB calls 450

Turn: (2,100) 4s (3 Players)
BB bets 1,950 and is All-In, Hero???????