I stutter and make phone calls. I don't like to but I do, regularly. I've done many half hour long plus phone interviews with potential employers. Best thing is to force yourself to do it. Then after awhile you'll get better and use to being on the phone. A few people may laugh at you or treat you differently but that goes with anything in life. I order fast food regularly and stutter throughout my orders. Most cashiers are nice and understanding about it. A few over the years weren't. Those few got cussed out. Live your life man. We only have one. I'm 29, btw.