I can't stand the sound of eating/drinking

Okay, so the sight and sound of people eating or drinking makes me feel anxious and angry. My heart beats really fast and there have been times where I've screamed in frustration, slammed my hands on the table to try and let my anger out and most of the time I leave the room trying not to cry. I can't sit in the same room as someone if I can hear them eating or see them eating, even if I cover my eyes and ears as I still know it's happening. My parents say that I should go see someone about it because they think it's something serious and it really affects my life and has done for 4 years. The thing is, I hate talking to people and I worry that if I do go then they'll tell me it's nothing and I'll embarrass myself.