I don't know if anyone else has this problem but I have a really pacific issue. In general just I suck at talking. I find it hard to put my thoughts to words, I never know what words to use and I never know what to say.
I talk like xQc irl and the act of using words to hard I'm always slurring them out even tho I try not to and I have a stutter and a slip so saying thing is very hard.
Like anything, it's practising doing it. Incidentally, this is one place using a chat bot might help you. These things are pretty good at carrying a conversation, and if you're not comfortable talking to a person, it could be a good way to practice.