It seems you lack basic information about your body and its functions.
Your penis is reacting to being aroused. All healthy penises react this way to stimulation--whether physical or mental. You probably aren't having enough orgasms to relieve the sexual tension that has built up.
The best way I know to release this tension is in self-pleasuring. This way, you'll experience a release of the tension as well as intense pleasure. And, best of all, you'll learn about your sexual response and what feels good to you, so that when you begin being sexual with a partner, you'll already be wise in the way of your body. Best of luck to you. Dr. J
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