The only solution is to get out there and keep doing it until the awkwardness fades, and it will fade. Once it fades, you can start working on the voice, the posture, etc., one at a time. (It's too much to work on it all at once.)

I've been doing this my whole life, and am still a work in progress, but the more I work at it the better it gets.

It's well worth spending the effort.