You surely matter!
How do you explain things like hope, fear, intention, desire, love...did they come from the brain? Are they from the Soul? Are they from the mind? The mind may be too small to understand the mind (McGinn). If you have hope to marry your girlfriend and intend to make her your wife, but think you will not have money enough to keep her fine, do you believe this can be changed by focusing in something different? What about your job? Hermes understood that the human mind is a collection of memories of interlacing (neural network of long and short term), where the body (your sensory system) only perceive things, that occur at this very time. Interestingly, the mind then is that it has the holistic ability to present the person as a complete thing and independent, whereas the body appears only when the mind gives you conscious attention. All the people take the limits of his own field of vision for the limits of the world (Schopenhauer), we look with our eyes out and assume as factual what we see, but often we ignore what about us is only part of what we are, there is much more of ourselves, within us; usually we only perceives it when it become a collapsed material thing that happen following our thoughts.
“Your mind will be like its habitual thoughts; for the soul becomes dyed with the color of its thoughts. Soak it then in such trains of thoughts as, for example: Where life is possible at all, a right life is possible” – Marcus Aurelius
Inside our minds we make choices with our thoughts, that in fact, become actions in our day-to-day; can we assume then that the mind is something existing, as material things are things in themselves or not? Our thoughts and resolutions are made in our mind but from where come the consciousness that allows decision-making? Since Ancient Greece ideas of people like Parmenides and Heraclitus, through Spinoza, Whitehead and Bohm, all attracted by the pursuit of the substance of thoughts, a chain known as panpsychism alludes to the idea that the material and non-material are two different sides of a same thing; it transfers the problem to the low level of fact, coming even if following on this reasoning, the electrons, for example, are conscious and have the same dichotomous problem, or have mind and body; which in fact may even be substantiated by research and theories of quantum physics that if by analogy, one can understand that the wave of an electron function is your mental part, while its measurable portion collapsed state in fixed reality, it is your core material, so to speak, within our ability and understanding limit. It is a difficulty to overcome the thought, but only it causes this difficulty (Zeno). Modern physics comes to the aid of all that, and it gives light to the relationship between small things and big things, what we think, it is closely linked to what happens in fixed reality, which is and relates.
“Your beliefs become your thoughts. Your thoughts become your words. Your words become your actions. Your actions become your habits. Your habits become your values. Your values become your destiny” - Mahatma Gandhi
Our observations about what is around us, has evolved from a conception of a solid sphere which is named atom, to the perception of a fluffy cloud of particles interacting with each other within the magnetic field and limited energy, which almost all space is occupied by emptiness, in which there is a whole range of existence and nonexistence, about all the particles taken so far as the last matter. These, independent of the question space-time exist and do not exist and, worse, are formed from nothing, formed according to the conception of the observer.
There are all the possibilities simultaneously, all that is needed to form the matter with its physical aspects measurable, body mass, electrical charge etc, and there is no rule stipulating that such or such a particle in specific compose the matter to which the observer collapse in fixed reality, even the particle that has become part of the whole body of the matter after its collapse will be perennial in the matter itself. Whatever the feeling on your boss, your wife, your neighbor, which ultimately are our feedback to what happens to us, come from the mind or soul, it is up to us, take towards freedom to choose how it will be, and this will bring us hate, pain and suffering or love, peace and happiness, we are responsible for determine the path we'll take.
“At the end of our lives we all ask, 'Did I live? Did I love? Did I matter?” – Brendon Burchard