I had a speech impediment as a young child, and it only shows up when I very mad.?

I had a speech impediment when I was very young. I was in speech from 3 years of age to 14, and the only time it show is when I am very mad. Most of the time I have a southern drawl, but the thing is I really want my tongue pierced. Would the tongue piercing make my impediment worse? would it help it any?