How to ollie higher and farther for clearng stairs?

Ok. I can ollie and 5 stair ok. I want to go bigger though and ollie 7 stairs and stuff. I've been skating 3 years so my ollie is pretty high. But i never really tried stairs until now and theyre FUN. How can i clear bigger sets? I get mad cuz i see little kids doing 10 sets and im 14 and can only do a 5 bearly. Also how can i get over the fear of approaching the stairs. From far away it looks easy but then you go for it you lose your .