First, some lady interrupted me to correct my squat form again. This is the third time this has happened since I've started going to the gym. It's always the same thing too. Leaning too forward. It's frustrating because I'm either STILL not doing it right or for some reason I keep attracting these people. I was trying to do low bar squat, by the way.
If random people are correcting you often you must really be doing something wrong and they just don't want to see a snap incident occur live in front of them. Leaning forward is never good. Lower the weights if you have to so you can get the form right first, but make sure you shove your butt way back out and keep it there for the entire lift while keeping your back protected/locked angle with the torso.
Look at rippetoe videos on youtube which also helps. Squats can be a tough exercise to learn on your own trust me..I found out i was fucking them up 3 months into SS.