Leg Press V.s Squat

[Weapon X]

Okay, I'll reveal my ignorance (not fpr the first time, I'm sure!):

1.) I am short - 5'5" and 165lbs.
2.) When squatting without any weight whatsoever, not even a bar, my knees hurt

Should I avoid Squats?
What is correct form for us shorties? Wide stance? How wide?

 

[sysopt]

I find the most comfortable, most stable, and easiest on the knees are legs slightly wider than shoulder width and feet pointed out a bit.