I only stutter sometimes?

I only stutter sometimes? Hi all! I'm a 17 y/o girl and I stutter. Mostly the first syllable of a word, or a monosyllabic word. I find that I mostly if not only stutter when I am speaking naturally, not when I'm reading something. I am mildly dyslexic, so reading has its other struggles, but yeah. Sometimes I struggle to articulate myself, like not being able to put words to how I feel, but even when I know EXACTLY what I mean/what to say, e.g. discussing objective topics like factual information and data, I find myself stuttering more frequently. Is this weird? Does anybody else relate?