You can be an introvert and still give a great speech. Preparation does most of the talking.

Public speaking is not an extrovert’s talent; it is a rehearsed performance, and rehearsal happens alone. Quiet people often do it better precisely because they prepare instead of trusting the moment. What looks like natural ease on a stage is usually somebody who has said those words out loud fifteen times in an empty room.

Write it out, then practise aloud until you know the first and last lines cold, since that is where nerves land. Do one run for a single person before the real thing. Expect to feel nervous anyway and go ahead; preparation does not remove the nerves, it makes them irrelevant.