How old are you? You're not good at eating infront of people? There isn't an art to eating, don't over complicate it. Eating is something everyone has to do to survive, so you needn't worry about that one. Its not like he will run to his friends and say ''oh my God she picked up her burger with two hands and ketchup dripped on her chin''. Table manners are a must of course and as long as you don't eat with your mouth open etc you're good. If you eat slow it's okay, keep the conversation going inbetween.