It's been almost 4 months since you posted, Rufus, so I hope you're not struggling with this any more. But in case you are....
There is growing evidence of genetic links to sexual orientation. Genes that cause us to be attracted to men or women. And my guess is genes that attract us to blonds vs red heads, young vs old, fat vs skinny. Now, I don't doubt that there is ALSO a component of life experience involved as well. So if your best friend at an early age was fat, you may grow up prefering chubbier people. If your dad had a beard, but you didn't have a good relationship as a child, you may grow up to prefer people without beards. Stuff like that.
Back in the 1940's Dr. Kinsey, along with others, did research on sexuality and sexual histories of men, predominantly college students. And placed their "subjects" on a scale from 0 to 6 plus X. Those scoring a 0 had NEVER, at any point in their life, had ANY sexual contact with another man or interest in doing so. Those scoring a 6 had ONLY had sexual contact or interest in other males. And those who had yet to have any sexual contact with others at all were rated as X's as they did not yet fall onto the continum. (For reference, I'm about a 4.5-5 on the scale.)
6's represented 10% of their research subjects and became the basis of "Gays represent only 10% of adults in America." And from one standpoint, and with a limited perspective, that would be mostly true. Mostly, because it only refers to men, not to women. (A seperate study was done on women and was published in the 1950's. Unfortunately, the concept of a woman having, let alone enjoying, sex in the 50's was SO counter to what was accepted by society that it wasn't accepted nearly as well. Where people thought children came from, I don't know. But if you look at shows like "I Love Lucy" from the time, you will see married couples sleeping in seperate beds....)
What doesn't get reported by virtually anyone, but which I find great humor in, is that while 10% of those researched came out as 6's (100% pure homosexual in thought and deed), only 5% came out 0's! So, globalizing the results of Dr. Kinsey's 1948 "
Sexual Behavior in the Human Male" there are twice as many gays as straights in this country! And the remaining 85% have had at least incidental sexual contact with members of both sexes. (Think playing doctor with both boys and girls growing up, or even more than that.)
Society has changed, and changed a LOT since Dr. Kinsey did his study. In America these days, it is generally NOT illegal for two consenting adult males to have sex in private as it used to be. Gay bars are not raiding on a regular basis with patrons charged with public indecency, simply for being present. And while long-term gay relationships where virtually unthought of 60+ years ago, today equal marriage rights exist in the majority of the country with the US Supreme Courth set to make a final ruling later this year!
In some ways, I envy you for the world you are growing up in -- the comparative levels of tolerance and acceptance, as well as the technological changes. In other ways, I don't -- I grew up in a world where walking back and forth to school by myself was "normal" and not viewed as potential "child neglect" on the part of my parents. And while it once was important to be "Out" practically screaming from the street corners that you were gay so society would have to acknowledge us, I don't think that's so important any more, at least not the confrontational part of it.
You are who you are, as I am who I am. Have you ever heard of a teenager sitting down with their parents for a serious discussion so the teenager could explain that they're *gasp* heterosexual? I haven't either. The cry for years against "gay rights" and more recently "gay marriage" is that we're seeking "special rights." And no, we're not. No more than mixed race couples were seeking "special" rights by seeking full legal status. It wasn't until 1967 (the year I was born) that the US Supreme Court invalidated state laws prohibiting the practice and forced all states to recognise such marriages, and still, nearly 50 years later, many people frown upon such couples.
I think the best course of action for gay and bi-sexual people today, and the path I myself choose, is to simply be who you while neither appologizing for who you are nor making a big issue of it. Currently, at 15, I imagine you have mostly male friends. You may or may not have started expiramenting with them. And while possible, I wouldn't be surprised if you had yet to start dating one particular individual and growing an emotional bond. Most males your age are driving FAR more by hormones than emotion or logic. And that's okay, you're still figuring out just what you want out of life and what kind of person (not just plumbing) you want to live it with.
I never "told my family I was guy." I never made that kind of issue about it. But I did bring my boy friend over many times when I still lived with my mother. Nevr for dinner or anything like that, though. Mostly to, uh, "hang out in my room" from which much moaning and headboard banging would eminate. And she's never made an issue of it either. While my sister was still at home (she left when I was about your age), I would frequently "borrow" her copies of Play Girl and even her vibrators and dildoes. She once told me she had a lesbian friend of whom she was quite accepting and that if I ever "wanted to talk about anything" she would be there for me. I never did, but when she moved out she "forgot" the box of magazines and sex toys which promptly disappeared into my room.
So, if you're still reading this, live your life, be who you are, and never appologize or make issue of that. For now, have friends over as you have in the past, and when the time comes that you're dating one person specifically and they're worthy of the title, refer to them as your boyfriend, but again, don't make an issue of it. (And that may not happen until you're in college, to be honest.) Just be who you are.