What happens when the negative feedback response to a stimulus

Ihave a really high metabolism and only weigh 70 pounds (13 almost 14). people always ask me two questions: do you ever eat and how do you eat so much and stay so skinny.i am worried that a high metabolism wont me forever. what are some safe steps i can take to maintain being fit. (also, i already work out i am a dancer so i get cardio a lot)

How you feel when someone is boastful and self absorbed when providing you a professional service? why?

Which influences are classified as part of your social environment? a) traits b) friends c) habits d) foods? me !