Confused Sexually

I am an eighteen-year-old virgin. I've always loved girls, and I would only consider dating/marrying a woman. However, recently I have been extremely attracted to muscular men, and I've even fantasized about a fling with a man. I don't know if I'm just confused because I've never had sex before, or if I'm bisexual. Is this normal?

— Ike, 18

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