As someone who is in the same spot that you are, I would like to answer your question from my point of view. (as a not fully out gay male)
You say that you are not completely out. Well if I was possibly interested/attracted to you, I would not hit on you or approach you as I would wrongly assume that you are not gay. Just like you are probably doing, I still worry about certain people knowing I am gay, so I am careful about who I tell, and being that you most likely do not appear or seem to be gay, I am not going to pursue you for fear of a negative reaction from a "strait" dude.
Again, you are not completely out. And I am taking a wild guess, but you seem like you are probably your average, everyday, non-gay acting male. As someone myself who is into sports, beer, and rock n' roll, I do not neccessarily give off a gay "vibe". And I sense you are the same way. So again, I would be very hesitant to approach you or talk to you.
You said you are a "fairly attractive" male. Personally, I think you meant this as more of a matter of fact statement, and not a conceited remark. I doubt I am the only person who feels this way, but honestly going up to and talking to someone who is "fairly attractive" can be very intimidating/scary. Regardless of being out or not, I would probably assume (if i though you might be gay):
1. you probably have tons of guys hitting on you all the time, so I probably do not have a chance with you.
2. rightly or wrongly, i would worry or assume that you are probably a snob or think you are better than everyone, because of how you look.
3. in addition, if you give off the impression of being intelligent, mature, and confident, i am definetly not going to approach you, as i find those qualities even more intimidating than looks alone.
Sorry if my response was long or complicated. I hope what I have said was of some use or help to you. I feel the same way as you do, I would like to have a boyfriend, but am not sure how to find one. And as time goes on I will hopefully become more secure and confident in who I am, then hopefully the boyfriend(s)will follow.