Anal stimulation doesn't make you gay. The anus has a lot of sensitive nerve endings, and inside is the male g-spot, which even straight men have the right to enjoy!
It is NOT what I would call a fetish at all. It is NOT messed up and it will not mess YOU up. It is
normal. No, this is not going to be a problem for you. Many women would love to give their man anal stimulation but because so many straight men are afraid of being called "gay", they never ask.
You don't need to stop. You enjoy it; it's safe, and it feels good.
Why exactly do you think premarital sex will be a good idea? I'm not understanding how that relates to you fingering yourself. Of course you have fantasies. Every man and woman does, EVEN MONOGAMOUS ONES. I do want to add that just because you have sex with one woman only doesn't mean you won't fantasize about other women. That's just how the brain works.
So what if everyone has had sex? I didn't have sex until
I wanted to, not when everyone else was having it.
So you're worried you're not going to get to have lots of sex with random women? That must be a guy fear because I certainly don't have it. Either you're dedicated to being abstinent until marriage or you're not. That's your decision to make but if you've upheld it this long and it means a lot to you, then don't break it just because your hormones are raging. You're still only a kid as far as your body is concerned. Men don't finish puberty until about age 20.
Sex is not "love". Having sex with random girls will not mean you found "love" for one night. It means you had a one-night-stand. That's it. It will mean you sold your body for pleasure for one night and possibly caught and STD and possibly impregnated a girl. Have fun with all that.
My suggestion is to ignore your friends who say they've all had sex. So what? I waited until I was 20 to have sex. That's when I was in LOVE FIRST, then came sex. Sex does not equal love and it cannot replace love. You need to remember WHY you're being abstinent and why it matters so much to you. You also need to learn how to control your body when it says "Look female!! Must have sex!" or you'll
never be able to marry a woman and be faithful.