It didn't lessen for me until my junior year of college, when I stopped caring about it. My advice is to stop giving a fuck and it'll probably lessen. I find that I stutter the least when I don't care. If you're that hung up about, seek out a speech therapist. They have techniques that may help (controlled breathing, gentle onsets, etc, etc, they vary by therapist).It doesn't work for everyone, but it may possibly lessen your stuttering.