So what do you refer to when you say, 'I'? From this post, you seem to be claiming that there IS no 'you', at all.
Materialism accepts the label 'you' and 'I' just fine. It places all strictly into deterministic, material terms. 'You' (presumably) are a human being which, on the Internet, goes by Nick. 'You' is a body, a brain, a history of being, a group of possessions, an ideology, part of a social pattern containing other human beings, and so forth. 'You' are reading this post right now. 'You', however, are not non-existent - or 'you' couldn't reply to this message.
You almost seem to be arguing some bizarre form of acosmism or nihilism, not materialism.
The brain is reading. The brain is watching. How it does so is still not understood, but that's the end of the line, materialistically speaking, and that's where the label finds its most fundamental use - at the brain.
You are your brain.
Likely your most stunning entry yet for "Dualist of the Year" award.
Nick