I think it would be a great idea to take deep breaths before speaking to let any tension or anxiety out of you and getting control of your emotions like how you were when you were lashing out that girl. By the way, Im 20 and I been stuttering ever since I could speak but thanks to taking deep breaths and figuring out how to control my emotions. I have been stuttering very little lately and is enjoying that I can now say at least a paragraph without stuttering compare a little over 3 months ago where I couldn't even say 1 word without stuttering. Lastly feel free to share those 2 small little ways on how to reduce your stuttering.