Metabolism important?

metabolism is you bodies ability to burn calories from what you eat, The higher your metabolism the more you can burn and eat this also means you will be skinnier but you can eat a lot, Like me I only weight 105 im 16 and im about 5' something not sure but I can eat A LOT more than my parents combined sometimes. Survival im not sure you would need to eat more because you body processes it so fast but once you've eaten you will have a bunch of energy to use.