Maybe you've visualized the perfect dive. Maybe your form is perfect, and your bathing suit looks great. You feel ready. But there's no water in the pool. Feelings are inside of you, but the pool is outside, and it doesn't care how you feel.
Sex is the same way.
If you had felt ready, this never would have happened. Sexual activity carries very real consequences. Sexually transmitted diseases and pregnancy are two of the more obvious problems. A million teenage girls get pregnant every year. And I'm sure you're all aware of the frightening epidemic of AIDS, and the fact that teenagers seem to be at particularly high risk.