There is no consciousness in brain activity
The brain is a magical thing and consciousness is extra magic on top. Now, it turns out that consciousness is not a thing at all - it is an artifact, a ghost in the machine. One way to get to grips with this is to look at brain activity. Brain activity is a crazy rush of jumbled up lights - you can get an idea of the lights by relaxing your mind and having someone clap in your ears, or have someone punch you in the face, or have a spinal tap and have the nurse jolt one of the electrodes running down your spine. In these cases, you will get a blinding flash of light. There is no consciousness in these lights, they are just there, but they are most certainly your lights. Consciousness is formed after, in some other way.
Now, the next thing to look for is consciousness forming from the brain activity, like a shadow emerging from a sparkling mist of pure twinkliness. Then you might ask yourself, what am I?
(I made a picture to represent what a flash of light might look like in case you didn't fancy trying out one of my other examples.)