Hey endospies,
llsouder's comments are pretty spot on.
For the squat, your depth is nowhere near deep enough. If you imagine viewing your squat from the side, there is also the strong tendency for the bar to go forward and your weight to shift forward onto your toes. What you want is for the bar to remain in a vertical line while your hip joint goes below your knee joint.
I wouldn't be discouraged by this, it takes some time to get everything sorted out. The results are worth the trouble.
What I would suggest is for now, re-read
the article on this site about squatting, plus related articles you'll see at the bottom of that page. You may also want to check out the Squat RX videos on YouTube. In particular, I would start with the one on
squat depth (#4).
I'd then remove the weight on the bar for awhile, and practice getting a feel for going below parallel, and keeping the bar traveling in a straight line when viewed from the side. You do not want to feel your weight going forward onto your toes as you descend, and you want to keep your knees firmly shoved out.
Maybe try that and post another form check video?