Thanks for telling me about these male professionals in the sport. To be honest, I couldn't believe the amount of males at the professional level. My question to you now is: how many guys do you see at your local barn?
Excluding the wife of the barn owner, there are no other girls where I keep my horses but that is because it is a racing yard. I'm fairly certain that you will be welcomed with open arms and make plenty of new friends :) As previously mentioned, there are men in every sphere of equestrianism who do very very well and once you enjoy yourself that is all that matters
Best of luck with it