Yeah, I have some thoughts...

If the bar is hurting your neck, it is proabably sitting up too high. It should not be sitting up on top of your traps like that so that it puts pressure on the spine. Grasp the bar as narrow as you can stand it (too narrow will force your shoulders into weird positions that probably won't be comfortable, but it should be narrow enough that your shoulder blades come together and push all of that trap muscle up to form a ledge), find the right groove for the bar. Typically this is in a small "shelf" created by the traps and rear delts. You can sometimes work with the bar a touch higher or lower than this... but that is pretty much the sweet spot. If nothing else, roll a towel around the bar, though I think that if you get your set up right, you won't need it.

Will squats stunt your growth? No. Next.

What are you looking to use whey for? It is ok, but in my opinion you would be just as wise to spend that money on whole food proteins. Dairy, meat, eggs, nuts. Skip the supplements and learn how to eat.

I guess that about covers that.