It's pretty good already. I have made a few edits to correct minor grammar points and make it a little more idiomatic. Of course, there might be other changes that could be made. This was just a 5 minute edit. But you should not be ashamed to submit this.
There is no doubt that everyone has an affection for the arts, whether it’s a career or part of their hobby. I explored my interest in music from the day my father bought me an acoustic guitar, when I was thirteen. Through countless hours of practice, great discipline and tireless dedication I learnt the basic techniques and theory of the instrument. I was so fascinated by the amount of passion and imagination it required to compose decent music. That was when I decided to pursue a career as a professional musician.
The emerging music technology, at that time, in the form of digital sound synthesizers and effect processors, fascinated me a lot and encouraged me to explore the field of music production. Learning proficient use of these products out there helped me explore the possibilities that exist in this vast field of sound processing. I was so motivated to understand what actually happens inside, and how the things are done. It helped me change my mind, and I decided to purse engineering professionally and keep music as a hobby.
My father was a great source of inspiration for me to follow the technical field in my career. He often used to talk to me about his work and discuss the basic electrical and mechanical concepts that I couldn’t grasp at that time. Even these very basic concepts were too complicated for me in my school life. For me, it ignited a thirst to learn what I was unaware of and found difficult to understand.
PS: this is in BrE. If you are submitting in an American environment you might want to change "practice" to "practise" and "learnt" to "learned".