I don't know how is the look of your eyebrows, but you can always pluck it a bit...
Keeping the same shape but making it thinner is a good way of get a more feminine look. There are a lot of men with thin eyebrows, so it wouldn't be something that ununsual.
If you feel bold enough you could even shape it a bit, but only a bit...men eyebrows are straight and women are arched, so you could arch just a bit.
But if you don't have experience plucking you shouldn't do it yourself as you can ruin your eyebrows with a wrong move...the ideal is to pay someone experienced to do it.