To the original post;
I do feel this way sometimes, since I do have a few "feminine" hobbies. I watch some "girly" anime, I love to write, and I love books about vampires (as long as there's no romance or sex involved; but that's my asexuality kicking in there). Honestly, if anyone tries to give me crap about it, I just tell them that it doesn't matter to me what they think; I like what I like and I'm not going to give it up just because people consider it "girly". Besides, "masculine" and "feminine" are defined by society; if you want to be physically male, that may or may not have anything to do with masculine or feminine characteristics of your personality. Everyone's different; some men are masculine, some are feminine, and most are somewhere in between. I think you should do what you enjoy, and not let it get you down that people consider it "girly".
And, if it makes you feel any better, my very close friend (who is male) is masculine, but he also writes poetry. I understand what you mean, that since he's a guy they would think "He's just being creative," instead of, if he were a girl, "She's just being a girl."
It's all ultimately up to you, but I think you should continue doing what you enjoy, and just ignore the people who try to tell you that you're not a man because of it.