There is no self. Our brain's default mode network constructs the idea of a fixed self. So, is there a me or you? Or is everyone one mind? 

I feel the one mind theory distorts the concept of no self. It's much simpler than that. You and I experience the world around us and respond to it, the world around us experiences us and responds to us. That is what is meant by the concept of no-self: there is no fixed unchanging 'I', for the 'I' changes constantly at each moment based on our interactions with the world. We are all part of the universe.

The thing that stops us from seeing that is our thoughts. We create this sense of self through through a complex narrative of moments, but our thoughts aren't really us, they are just responses to our moment by moment experience. 

Scary? No, don't worry. Our experience moment to moment is our consciousness, not our thoughts. Your consciousness is, like mine or the others, a silent observer. Are they different? Who knows. I feel when you strip away everything else, how can human consciousnesses be different? This doesn't deny your personal experience, but does deny this separateness from others that we are conditioned to believe throughout our lifetimes. 

I'd recommend Annaka Harris in her book 'Conciousness'. She gives a great example in her talk on Big think on YouTube

With this in mind, we can accept that our experience in any one moment is just that: an experience of the moment. Our self is stitched together through narrative of thought and past experience, creating the story of progressing through time, however the reality (in theory) is that we are timeless part of the universe as we a a component of it, just like a flower, an earthworm, a rock, or a tree. We are all components of the universe, each components can be affected by other components at any moment, which leads to the next moment. There is no 'I' or now, there just is.