I am chewing too loud?

People tell me, when I eat I chew really loudly. I chew with my mouth closed, with my molars. I have a SLIGHT under bite, if that effects anything. The only way I can chew quietly is by either chewing so slowly, I look depressed, or by sucking on the food until it's soggy...which can also make look depressed or sad, eating so slowly. What can I do? I chew the same loudness with my mouth closed as I do open.