Why can't you tickle yourself?

Because your brain already knows what's coming :)
And you dont know what's coming when someone else tickles you?
I think most of it is mental from two angles, either you dont expect it so it's the surprise that you couldnt give yourself, or you're anticipating it and there's a tension to it, which again you wouldnt give yourself, but there are places where you're sensitive enough to tickle yourself, most of which have been mentioned
 
That was when I was 12 actually if you must know.

And this is on the bottom of my foot, not between the toes where athletes foot 'normally' occurs.

Well, you could be 13 now:). Anyway, as you tell tell from my name I've probably seen about 46 million cases of athletes foot.
 
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