What makes corn chewy
Storing it in the fridge and letting it sit around for too long after it's been picked. Sweet corn is best the very day it comes off the stalk, but can hang in there for two days after max. After that it's trash.
Cook by grilling, as Larry said, or you can throw them unshucked into the microwave for 3-5 minutes, depending on how many ears. If you must boil, throw the shucked ears into hard boiling water for 5 minutes or so.