You can't feel your brainwaves, but they are active all the time and play a vital role in everything we do including: focus, managing our mood and stress levels, sleeping and thinking.
The common problem in the various difficulties that people are suffering with are a result of brain dysregulation, making brainwaves that are too fast or too slow in certain areas.
The brain can be influenced chemically through medications or supplements. It can be influenced electro-chemically through neurofeedback or neurostimulation.
Anyone can learn to change their brainwave patterns through neurofeedback, which is biofeedback for your brainwaves. With feedback, you can learn to change your brain.