I usually sit facing the stroke I have a box and I like to yell into it It's my job to steer the boat Who am I?

You are likely a coxswain, a vital member of a rowing crew. The "box" refers to the coxswain's seat or area in the boat, and yelling into it indicates giving commands to the rowers. Steering the boat is also part of your responsibilities, ensuring the crew stays on course during a race.