First of all, penis size is a number one worry among guys. Second, your penis is perfectly normal. Penises come in different sizes and different shapes. When flaccid (soft), penises can be anywhere from an inch to several inches. When erect, all these different-sized penises tend to “even out” with each other. So the locker room is not the best place to compare penis size because the guy with the biggest flaccid penis may not have the biggest erection.

The other thing to keep in mind is that, as a teen, you are not done growing yet, so your penis may not yet have reached its full adult size. It'll save you plenty of worrying if you stop comparing yourself to others during your teen years because people develop at different rates.

What's more important for you to understand, though, is that penis size doesn't really matter when it comes to sex. A lot of guys grow up learning to measure their masculinity by the size of their penises because they believe penis size is important. (You hear people jokingly say things like, “It's so big I can barely get it through the door,” and stuff like that.) This is all pretty much baloney and has nothing at all to do with how sex works.

For guys who are attracted to women: The truth is that the vagina is elastic. (It has to be in order for babies to be born). So a woman's vagina can tightly accommodate a big or a small penis. In fact, it can tightly accommodate something as small as a finger. Also, most of the nerve endings a woman has in her vagina are concentrated at the entrance. So extra penis length won't necessarily do that much in terms of giving a woman pleasure. And even more importantly, the most important cluster of nerve endings for women are in her clitoris, and you don't need a penis at all to find it.

For guys who are attracted to guys: The truth is that giving pleasure to a man doesn't require a large penis either. A large penis isn't necessary to reach the “male g-spot,” the prostate. The prostate lies within a finger's reach inside the anus. So extra penis length won't necessarily do that much in terms of giving a man pleasure. And many gay men prefer oral sex or mutual masturbation to anal sex.

But maybe most important—sex isn't about competition (who's bigger, who's better); sex is about sharing, communicating, intimacy and pleasure. So the best lover is not the guy who has the biggest “equipment.” The best lover is the guy who is best at communicating with his partner. He finds out what his partner's feelings are and shares his feelings. He learns how his partner likes to be touched (and what he or she doesn't like). And he shares with his partner what he likes and doesn't.

It's not the size of your penis that makes you a “real man” or a good or bad lover, it's how you think and how you act.