Years of practice. It sounds horrible and probably annoys you but sadly it's true...
Computer Music Production is an
incredibly complex subject. I imagine it's similar to learning each branch of Science to a professional level, Quantum/Astro/theoretical Physics, Biology, Psychology, sociology, Anthropology e.t.c. Each subject having an incredible amount of depth and inter-relating subject matter.
This is how the world of sound creation works, every aspect of it has an insane amount of depth, from the purely technical; The frequency domain, the psychoacoustics of sound as vibration and how mathematical relationships between frequency ratios translate into an emotional response; The science of synthesis, from subtractive to additive to granular and more, the incredible complexity that each of these hold, on to the application of audio processing; Amplitude, Panorama and frequency, use of effects and how each of these work.
That's before we even broach onto the right brained creative aspect of it all; the use of theory in a creative manner, the soulful application of composition, melody, harmony, counterpoint, different scales keys and modes, modal interchange, rhythm, textural and timbrel cohesion/contrast, consonance and dissonance, the use of silence.
And here I am just scratching the surface of the true ocean beneath while simply naming the subjects. you can imagine for yourself the truly vast amount of
stuff there is to learn about this.
The only advice anyone can give you to keep on doing what it is you are doing right now. Keep learning, keep searching and finding new information to learn. Accept that you're not going to make a tune any where near as good as what you hear released for a
very long time. You may get frustrated and give up, you may not, and you may one day, like a lot of us here, find yourself in a position where music has become a truly deep part of your life, because that is the only place mentally and emotionally and spiritually you can aim for if you truly wish to get what you hear in your head out into reality.
I'll leave you with a quote:
"I often think that people who are not trying to be creative are so much poorer than those who do attempt to make things of beauty. whether it is music or painting or poetry or what not, i think what matters is trying to make the universe a more beautiful place than it would be had we not been here."
Good luck
