Have a peek at S.E.X., the in-depth and inclusive young adult sexuality guide by Scarleteen founder Heather Corinna, newly updated for 2016!
I don't know if you are Orthodox or not, but if you are, perhaps you've heard of a term called "taharat hamispocheh" (rough transliteration). These are the laws (halacha) of family purity, or so they're called. They cover life situations involving sexuality and sexual activity.
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What we are talking about here is celibacy, the deliberate choice not to have a sexual partner for any period of time. There's nothing ambiguous about that. Being celibate entails sharing NO sexual acts with a partner: any kind of intercourse (vaginal or anal), oral sex, manual sex, and so forth. In other words, no physical, sexual contact with others; meaning any genital (penis or vulva) touch, with mouths, hands or anything else between you and someone else is off limits.
When I was 16, due to a very irresponsible pairing of an impetuous one-night stand and a few days of partying, I woke up one morning to discover I had mononucleosis and walking pneumonia. As if that wasn't enough, my period was late.
If you have NOT gladly and freely consented to and participated in sexual activity -- if you have not in some way said a big yes and wanted to keep saying a big yes -- and someone else had sex with you anyway, that is rape. No matter what ANYONE tells you, it is not your fault. There certainly is fault, but it lies with the rapist, not the victim.