Have you asked your parents if you ever stuttered when you were younger? If it is a late onset of stuttering, just know that the more you fear stuttering and try to avoid it at all costs, the more you'll reinforce the shame and the blocks are likely to get tougher, not easier since you are reinforcing the fear and you'll start developing poor speech behaviors. If your stutter is mild, I think it's a lot smoother and easier in the long run to just stutter on the first word, because honestly no one cares and then carry on as you were.