Many philosophers say it's impossible to explain our conscious experience in scientific, biological terms at all. But that's not exactly true. Scientists have explained why we have certain experiences and not others. It's just that they haven't explained the special features of consciousness that philosophers care about.
When I was young, I had this feeling that there was this handbook that I had never gotten that explained how to be, how to laugh, what to wear, how to stand by yourself in the hallway. Everyone looked so natural - like they all practiced and knew exactly what to do - even the way they pushed their hair out of their face.