There is a lot in your post to respond to. First off: you are not the first young to realize from an early age that he is attracted to boys. Gay people have been around as long as there is recorded history.
Second: it sounds like your family is religiously conservative. And that they have conservative, if not, uneducated ideas about gay people and sex.
How about let's jump into the sex part?
Anal sex is practiced by straight and gay people. In fact, is some cultures anal sex for straight people is their way of practicing contraception. Thing is, no one likes to talk about these things. It's not that anal sex is dirty, but rather, that all sex is considered by some to be dirty.
BTW: not all gay men practice anal sex. It's quite an individual matter. That said, the prostate, located just inside the anal canal, can give a man intense pleasure. Of course, learning to experience this is best done with one's partner wearing a condom for the simple reason that it can protect one against STD's and HIV. It's the same deal for straight people too. Unless one is with one monogamous partner, protected sex is safer sex.
And let's use some logic here. If anal sex is 'dirty', what about the penis and vagina? Pee come out of there. And isn't THAT dirty?
The thing is: we can make something dirty or we can make it beautiful. It all depends on one's point of view- especially as personal desires go.
Now to religion. When I was your age (I am 52 young whipper snapper), I also thought that God wanted me to be celibate. I even though of being a priest. It took me a while to realize that those feelings had more to do with my fears than with being called by God to serve in the priesthood.
The bible says that the Kingdom of Heaven is within. To me, that means that no matter what others many think of you, nothing can change your nature- that is- the love that is inside you. Of course, since you are attracted to other men, your love is going to be expressed differently. But it's still love. Real love.
And who says you can't have children? Gay people can - and do- adopt, or have children with surrogates. This idea that gay people should not be parents is a very uneducated view. In fact, many gay people- if you think very carefully about it, are often in charge of the raising of children, from teaching in school, to teaching in the arts. Gay people are responsible for passing on to new generations the Arts, Music, Literature etc. In fact, I will be bold here and say that, without gay people, there would be no
About God's Love. If you sit quietly over a period of time, that is, quieting your worrying mind, you will undoubtedly find that the Still Small Voice
in your heart does not condemn you for wanting to experience love with another man any more than it condemns a straight boy for wanting to experience love with a girl.
Now. You could try to reshape your desires, that is, try to become straight, or least, act straight. But this is a terrible path to take for the simple reason that sexuality is not a matter of choice. Sure. Anyone can sleep with anyone, but we're talking about matters of the heart here, not about making OTHER people feel better in their ignorance.
I would hold off dealing with your family for a while. Wait until you have a better sense of yourself, and you have a support system, that is, a 3D community of friends you can rely on. You need that more than anything.
Wishing you much happiness,