Re: Feeling intimidated
Welcome to MT! We're glad to have you.
I started martial arts myself about two and a half years ago, and my art is particularly male-heavy. I agree with you that it can be intimidating sometimes, but there are things you can do to make yourself more comfortable. Above all, talk to people. It's fine to ask your training partners to go more easy with you, and for the most part they'll respect that. You can also bring up your concerns with your instructor too.
As Kelly said, there's also some value to being challenged and pushed a bit by those with a greater skill set. You'll grow and improve faster. Personally I prefer working with men because their greater size and strength forces me to work harder to compensate and adjust. That, and if I ever truly need these skills in an emergency I'll probably be facing a male opponent anyway. Food for thought.
In the worst case scenario, if you find you're really not comfortable in this particular class, there's nothing wrong with voting with your feet and finding a different group to train with. I'd encourage you to stick it out if you can - either way you can learn a lot, not just about the art but about yourself and your own capacities.
We can fail and fail. But, deep against the failure, something wars. Something goes forward, something lights a match, Something gets up from Sangamon County ground armed with a bitten and a blunted axe. And after twenty thousand wasted strokes brings the tall hemlock crashing to the ground. - Steven Vincent Benet