OMG!!!
Eating ice is not the same as Pica. Pica is a disorder of eating non-foods. Ice/water is a food, it nurishes you, you die without it. Pica is the compulsion to eat things like chalk or dirt or uranium. Pica is often associated with iron deficiency, there are however a lot of people who have Pica and don't have low blood-iron levels, look at most toddlers, they'll eat anything that isn't nailed down, -that- is Pica.
People who are iron deficient often eat ice, so do pregnant women, people with Chronic Anxiety issues and people with hypertension. It's also pretty common if you live in the desert. If you're eating enough ice that it troubles you go see a doctor but don't think that the fact that you like the texture of ice crushing in your mouth is a sign of major illness.
If other people don't like the sound of your chewing ice, if you are concerned about the pressure it puts on your teeth or dental work, try getting crushed ice to chew on.