Yeah i did this for quite a while, actually i didn't share for about 2 months was too busy listening but wan't in newcomer meetings so that is different i guess.
Some lady who turned into a good friend, came up to me after one meeting and said it is time for you to start sharing so i did...so for a while i could feel my face going that funny way as if i were blushing (and probably was lol) and would get all hot and bothered...it took me a couple of months of sharing each meeting to start feeling comfortable...also once i had finished working the steps and was working them on a daily basis i felt that my shares were much more useful anyway so my confidence built up a bit...then i had to think am i sharing with enough humility lol
Its all good, keep sharing and listening:-)