Can not having in intimate, physical contact for 21 years make you vulnerable to gay actions?

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I'm 21, and I've never kissed, hugged in an intimate way, or had sex. It's a long story. Anything turns me on because I get aroused easily from not having sex. By not being physical, or not have been in a relationship, I get a tingly feeling when near a guy. If I'm near a girl I'm just trying to look cute for her, hoping she finds me attractive, though I'm too nervous to flirt with her. I'm not interested in girls but I get interested in guys off and on. Sometimes I wonder if I'd resist if I were in a situation with a guy. But sense I've never been in a situation with a girl either, I think being in a situation with any male or female could tempt me. It's like a desperation for intimacy, so I'd shack up with anyone.