I have to agree with MP. My averages won't mean anything to anyone else. It's not meaningful to compare my race to your solo ride, my flat ride to your hilly one, etc so there isn't any reason to say anything. I think there are probably a lot of women who think they ride slow that are very strong. They read some of these posts and get discouraged and I don't feel the need to be part of that.
(oh and to give you an idea about how much of a difference conditions can make.... my 20 something mile zone 1/2 recovery ride was accomplished at a faster "average" speed than my 101 mile mountainous race this weekend - now which do you think was the harder, more challenging ride..... even comparing me to me we're still talking about apples and oranges)
Just be aware that when you are talking club rides many of them aren't classifing rides on the average ending speed of the ride - they are talking about the average pace of the group on flat ground in ideal conditions! You may fit nicely into a faster group than you think.