Same with me. I only realised I was bi a few months ago as well though I've never had a boyfriend.I'm also bisexual. I only realised it a few months ago, it just suddenly dawned on me that I was attracted to both men and women. It took me awhile to actually identify as it, but I do now. I have a boyfriend, and all my previous partners have been male, but I'd have no problem dating a female.
Nothing really, I guess I just found it odd seeing three bisexuals in a row when everyone I've met has been on one end of the spectrum, either gay or straight. I mean no offense by this of course.