Knowing what words I will get stuck on before I talk.

Knowing what words I will get stuck on before I talk. Hey everyone, I was wondering if anyone else has this problem. Before I even begin a sentence, I know what words I will get stuck on. And it's not that I know I have experience stuttering on one particular word or sound so I think I will get stuck. Does anyone else have this problem or maybe have any ideas of why this is?