Many people who have to present tend to “think” too much. They think about where they should stand, how they should move, where they should look, and so on. These are all important aspects of presenting, but if you concentrate too deeply on each individual aspect you’ll miss the chance to “put it all together” for the audience. You’ll appear stiff and unnatural.
Think of a musician playing a song with “feeling” instead of just playing individual notes. The audience can hear and “feel” the difference. It’s no different with a presentation. Your words and movements should come naturally, as if speaking with an old friend.
This can only be achieved with practice. But you must practice correctly. And that means concentrating on being yourself and developing your own style. Practicing this way will allow you to become a more confident, and natural presenter.