Plenty of seasoned performers still get stage fright. They just walk on with it instead of waiting for it to leave.

Experience does not remove the nerves. What it changes is the relationship, so that nerves stop reading as a signal to wait and start being part of the furniture of doing something that matters. The people who look calm are rarely calm. They have simply stopped requiring calm as a precondition, and waiting for the feeling to pass is what keeps most people in the wings.

Walk on with the nerves at the next opportunity. The presentation, the solo, the first shift, your hand up in class. Let the hands shake and do it anyway, because that is the only version of this that ever gets easier.