It is said that you can speak something into existence. I agree. However unless you are trained from a young age, like a pianist destined to be a concert great, you may get it wrong more so then you get it right. The key is to continue to practice. Think before you say something. What I have learned in public speaking is that when a question is presented to you or you get thrown off your mark. Take a minute, gather your thoughts. There is nothing wrong with pausing to avert a disaster or negative reaction from what you have said rather what you could have said. In the Bible there were so many times Paul misspoke, because he failed to understand his audience. He offended many. He learned to say things in a different way after much practice. It takes time to retrain yourself to do so. All you can do is keep trying. Ask forgiveness and get it right the first time.
Philippians 3:13 Brethren, I count not myself to have apprehended: but this one
thing I do, forgetting those things which are behind, and reaching
forth unto those things which are before,