With a high bar position, the bar is actually resting along the superior angle of the scapula. It should not be resting on the neck.
With a low bar position, the bar is resting further down on the scapula and on your rear delts. The position will necessitate more forward lean, but, as with a high-bar position, the weight should NOT need to be supported by your hands.
Frozen sleeves (the part of the barbell where plates rest) that don't rotate freely are a sure way to sore wrists and shoulders. Make sure that the bearings are well maintained and oiled.
Bent bars can be a shoulder and wrist wrecker. "Sighting" the bar is an easy way to see if the bar is bent. Fix your eyes on a stationary reference point while rotating the bar and check to see if the bar's position relative to the object changes. If so, unfortunately, it's time to find a better bar.
For further reference, see Squat Rx #4: Bar Placement & Squat Depth