I listened to a few of your videos. Your voice is not annoying!! TBH, I did find it hard to understand at times. Mostly as you were finishing a sentence, you would speak faster and articulation wasn't as good. So maybe just need to slow down? (Or, it could just be your accent as I am Australian).If you want to be an actor I would see a speech pathologist. Not because there is anything wrong with how you speak, it's a lovely warm unique voice - but acting requires your voice to be clearly articulated. I only detected a slight lisp and have never thought of a lisp as annoying. Wouldn't worry about that.