Pretty much what everyone else said; i'll add my two cents because I was trained in classical piano and guitar but experimented with composition on my own

You need to distance yourself a bit from classical music theory, worry less about your individual note structure, harmonies, pitch, melody, and engage more with the overall 'vibe' if that makes sense, i'm sure you understand this to some degree from practicing composition, but it's easy with classical training to get very caught up on individual aspects as opposed to the way the music is actually being carried over time.

Basically, if you already have a good ear, utilize that more than your noggin', listen to how the music sounds and focus on designing the sound to create the sort of feel you want it to manifest, as opposed to worrying about whether it's all rhythmically, harmonically etc correct;

obviously, having the classical training will by default put you into a position of advantage when it comes to those aspects however; a big issue I see with a lot of newbies to production is they have these great ideas and fantastic sound design, but it's all out of tune and doesn't follow much of a melody that really 'works' comfortably;

where as with those who have classical training, it's kind of the opposite in my experience, you think of these great melodies and harmonic ideas, but struggle with the overall sound design

it's almost like trying to speak a different language by directly translating word for word; because it works in the language you know, you assume it'd work the same way in their language, but the overall structure and differences in the language throws you off and makes it, at times, difficult to understand