Anybody taken acting cles?

I've always been interested in acting -- was always doing impressions of my teachers in high school, entertaining family at home, etc., but never really got into it seriously. I've acted in a few small school plays, etc. during college. I'm now in my early 30s, with an otherwise great career ahead of me, but still want to do acting just as a hobby on the side. Just one problem: I have a stutter in my speech. I get terrified by the thought of getting up on stage and screwing up my lines -- especially since I can't change the words or anything, I have to say them exactly as in the script. Anyone else had a similar problem? I know there are many actors like Bruce Willis, James Earl Jones, etc. who stuttered as well, but I'm still nervous. Anyone relate?