Hmm. Well here is the thing, reading through this you've mentioned a couple of times that you know you are bi. Here is the thing, you are the only person that can know that for you. No one else can define who you are, so to ask that isn't really the right question here. I'm not gonna tell you what you are because only you know what you are... and I have never been a fan of someone else telling me what I was. I can say this though, if you know for a fact that you are attracted to both women and men (even if the men you are attracted to are more feminine) then you are already entertaining the possibility of being a bisexual man. I don't think that is really your question though... based in how sure you sound about being bi, I think your real question is whether or not you should come out that way. I can't tell you that you should or shouldn't. I don't know you and I don't know your life to tell you if its a great idea, but since I've just recently come out as bi myself I can say that there are some benefits to being out.
Unlike you, I'm not attracted to feminine men. When I am attracted to femininity it is in a female, and when I am attracted to masculinity it is in a male. The two are very separate for me. This is one of the reasons why I needed to come out for myself. I can't justify checking out and drooling over a masculine man and then switching to a very feminine woman, though I can say a person that has been with both that because my attractions are so different, they make for two completely different kinds of sex. Anyway, not to stray too far off topic, but what I mean is that for me, I had to clearly define those two pieces of my life for myself and for everyone around me so they understand me.
You however, may not need or want that. Being attracted to feminine men is something that I've seen in many straight guys because by nature, they are attracted to femininity. In high school I've known a very masculine jock who was always getting BJs from a very feminine gay guy, and he justified this saying that the guy reminded him of a girl. This jock, however, is now married and has a kid and lives a completely straight life. So I mean, it is really whatever works for you. I hope you figure things out and no matter what happens, don't doubt yourself, because yourself is the only person that A) knows you and B) is not going to lie to you.