I want to make youtube videos, but speaking isn't my best skill, I tend to stutter a lot, change words out of order, mispronounce things, etc.

An idea I had was to write the script and have an AI trained with my voice to read it for me, and tweak the intonation of certain phrases/words when necessary, but I don't know where exactly to start.

I have quite good knowledge of how an AI works and what limitations it has, so I believe that "training a model to a person's voice and slightly tweaking some parts of the final result" is within a regular AI's possibilities.

(yes, I know, to provide data for the AI I need to transcribe the input text, but I can take care of that)