This is an old question, but I will answer it anyway...(Give women a little credit. They are not dumb). A woman can tell the difference between an experienced male partner and an inexperienced partner in one night (or in a day) whether you talk about it or not.
However, by "not talking about it" you are not comfortable with what you have done (ashamed) and since relationships are about trust, I don't think that would be the right start to a new relationship, do you?
You may want to think about this before dating again. Speak from the heart, quit judging yourself and face your fears "head on." It's really not that difficult after you have gotten past the uncomfortable part.
The truth may hurt a bit, but "honesty" is still the best policy.
~ nmpb (aka/pee)