I'm far removed from YC and the startup scene, but as an exceptionally intelligent black man I do have experience with scenarios that might lead one to feel that way. My advice is simply: don't feel that way. Be completely confident in yourself and abilities and ignore what others might be thinking. YC should not be seen as validation in any way, but as a stepping stone for your personal goals. In that light, the exact reasons you were funded are of no concern to your future success. Besides, I'm sure many a founder has been accepted for superficial reasons (being from the right school, having the right look, etc). If certain of your traits happen to match the current funding trends then so be it; consider it a stroke of luck and nothing else. I guarantee you the next white kid from Stanford that gets funded will not be sitting around wondering if he really belongs there.