If you're worried about coopting a disability, you might be ok saying that you suffer from some speech disfluencies (granted that may be harder to say so reword cautiously). Before I knew what was going on with my speech, I would identify as a person who stutters. For me it was just easier than going into a long diatribe about what I suffer from and how it's unique and "not really a stutter but it's like a stutter".