It took a long time for me to not think about when I speak. But I still have bad days and have to focus on it more. It is difficult to get into the habit of doing it because you are trying to do something you’ve been doing a certain way your whole life in a different way. You need to break the muscle memory you are currently doing. It would be like writing with your right hand your whole life and then trying with your left hand and expect it to be easy and not have to think about it. Just keep working at it and focus and it will get easier.