When I compose, I rarely ever think about music theory - actually, though I took lessons in medium-to-advanced theory when I was younger, I feel like I utilize only the most basic music theory: not to use parallel fifths, know what the inversions are called, what some seventh chords are called, a little bit of polyphony, that sort of stuff. What I think about when I compose is really what works for the music emotionally, proportionately, melodically, and harmonically, and I try not to write in formal structures too much, unless that's my intention. My personal philosophy is that expressivity is more necessary for music than form, and that theory is just there to catalogue and taxonomize common mannerisms in music.
Historically, this question seems to have been an issue for a while now, namely the Wars of the Romantics. You can observe this in the music of the Brahmsian faction vs. the Lisztian-Wagnerian faction, where the former seems to have valued theory and form before everything else, while the latter valued emotional expressiveness and weight to formal structure (though both sides had members who did things characteristic of the opposing front). At this point in time, though, it really boils down to what you feel is right for your music; for some it may be that form gives them more ground than fluidity, and vice-versa. As you continue writing music, you will learn what you feel is best for your music and you will adapt it into your writing. This is one step forward for you, learning that music is not all theory.
And, just to remain consistent,
just as all of what I have said is mine. 🙂