Kickoff return help? (blocker)?

I just got the opportunity to be on kickoff return. I'm one of the front 5 guys. I'm not very big but I'm really fast and I'm not very good at blocking either but I can hit the sled and drive it good. Coach decided to put me on this team, replacing a really good big blocker. This is my first year of football (I'm a freshman on JV) so I need some help please. When we were doing kickoff return, someone in scout kickoff ran me over really easily and I have no idea what to do about it and I have a game tomorrow. How could I prevent from getting ran over and blocking someone when they are running full speed at you?? Thanks I appreciate it.