Belial, you must be coming across pretty good to people for them to feel you're so capable...and in fact, you probably are very capable. There are always things other people think we know or can do, that we really don't and other things we wished we knew or could do but can't. That doesn't make you a fraud, just a normal person. The good thing is that you realize that you don't know everything...and if it's important, you'll learn it; if it isn't imporant, so what--don't sweat it!