You ignore the fact that he may surpass you and just do what /you're/ capable of. He shouldn't really matter. Sure, he can give you sort of a goal in mind for what you'd like to do, but honestly? The world would be a better place if everyone didn't mope all the time about being worse than someone else. Be happy for what you do and accomplish, feeling "low" compared to someone else will only make you do worse, from personal experience.
Pretty much, just do your best. For all you know, you may do just as well. But cowering isn't gonna help.