I feel the same way, especially as you say with friends getting rejections, I think perhaps we are both quite self-conscious? Nevertheless it was not 'your (or my) fault' in any way really, and I think in a sense your friends would want you to be happy in your life, so you shouldn't be negative and end up dragging their spirits down in the process.
For me personally I think my offer was very very lucky and I could have easily got a rejection, but obviously if I say this to my friends they would probably get even more irritated, so I think I should just be very grateful while acknowledging their unfortunate situations. If they are still jealous or envious or angry at your or anything...it's a cliche, but I suppose that means they are not so great a friend.