Do fantasies or desires ever mean anything?

I've got no experience with guys whatsoever, and a little with women, but lately I've been fantasizing about homosexual things. Sexual encounters, from receiving anal to giving oral, or just coming out. I was sort of a "late bloomer" so I've struggled with sexuality before, even confiding in some people over the years that I might be gay, might be bisexual, who knows, and every time I've had this sudden feeling of regret after telling them and then had to backtrack and make something up as to why I've felt that way.I can't say I really find guys attractive. I mean, that's not quite the first thought that pops into my head when I see a woman either, but I can recognize a cute girl when I see one, whereas I just don't notice that with guys. But for some reason, a part of me not only fantasizes about gay sex, but actually wants to be gay or bi. Like I sometimes catch myself wishing I was bi, and just wanting to start coming out to everyone I know.So when is a fantasy just a fantasy, and when is it something more? Does all of this mean anything?