You do have your own way of speaking, like we all do.

We get influenced by expressions we hear, gestures we see and behaviors from birth to the present moment.

What you need is to grow awareness of how you speak, that is the main key here. It is obvious that you’ve put your focus on how others act and therefore, your mind follows that pattern. Our minds tend to follow what we tell them to focus on.

As an exercise, try to record yourself speaking. If it’s important to you, join your local toastmasters and there you’ll see people who develop public speaking and grow into their own area of comfort.

On the side and, as a personal suggestion, don’t make a big case out of it. You don’t lose what makes you special just because you don’t have a particular set of expressions that people associate to you.