Of course "I" do!
Years ago I was thinking about starting a business. The concept
of the "limited company" was explained to me by saying that it
was a fictitious individual. (Or words to that effect -- this was a
long time ago.) That does not make it wrong to use the word or
the concept -- in general terms. But you have to realise that
exactly what it means will depend on the context (oh no not
that again!). And in some contexts it will mean nothing. This
is more than just the general context-dependence of meaning.
The point is that, unlike rocks and such, there is nothing "out
there" that corresponds to "self" or to "company". These
memes play very important parts in our culture, but for that
very reason it is important to bear in mind their limitations.
And more generally, it is important to realise the difference
between memes that have concrete referents, and those
that do not.
Robin