How many dimensions are there?

Is there really eleven or twelve dimesions of time and space? That's what the latest string theorists say about the Universe that we live in. Do we just live in these four and have "twins" or ethereal beings that shadow our movements in the other dimensions? Are they Heaven or perhaps Hell? Are we-coexisting with aliens from those areas? I'm I driving you nuts yet? I certainly think I might be reaching that point. I only know that "I think therefore I am" is the basis of all philosophy and thought. I'm going to give you folks my daily routine in this dimension as I go along in cyberspace.