How can i impress and show my coach that he should put me at RB?

Learn how to spell first. If your better, you really need to convince him that your the best. At the end of the game, don't let them tackle you. If you are as good as you say you are, bulldoze through them, then hit the turbo in the open field, and dodge the safety by using a very good juke. That is how my friend got to be starter, and he had this exact problem.