Mostly men make "moe" artwork. Moe is, simply put, drawing everything to be as sweet and huggable as possible, usually giving characters some odd quirks and weaknesses to get the protection instinct from the viewer as well. When women draw moe, they tend to deconstruct it, such as mixing adorable artstyle with horribly broken characters, or really cute and cuddly-looking gore.
I think that, well, girls tend to like guys who can draw other things than monsters, naked women with huge breasts, and violence. I'm not saying that all guys draw those thing, but most hobby-artist guys draw things like that.
You shouldn't worry. Also, how can you tell if a drawing is masculine or feminine? Some people think that the paintings by the artist Mucha has to be drawn by a woman because there are lots of flowers, drapes and beautiful women, but Alphonse Mucha is a man.
Who says you can't be a bit "feminine"? Many guys are "feminine", especially artists. The people who say you can't be "feminine" are absolute idiots, ignore them.