As a kid I took things literally a lot, but now I've learned not to.
However, sometimes I still do think kind of concrete, or just think that a metaphor is silly, though I know what is meant by it. Eg. to "stand as if you were fallen down from the moon". In fact I'm not sure what it exactly means, but probably standing like "zoning out" when you're expected to do something that should be evident to do.
I mean, it's not possible to fall down from the moon, since it has gravity.
And even if it were possible, you would certainly not stand up or even be alive...
So, I still think it's a silly saying.
(Don't know if it exists in English. I don't hear it very often in Danish either, but my dad used to say it to me if I just stood in my own thoughts without doing anything, when he eg. thought it would be evident for me to figure out by myself that I should help with the dishes or something like that; but I think it was kind of zoning out in an aspie manner, but we didn't know about AS at that time).