It's not in our power to change or control our dreams unless you learn to have lucid dreams, and that alone is hard enough. These "Wet dreams" are a part of pretty much everyone, since we all have them, we just have to learn to live with them.
Sexual dreams are entirely natural, especially at your age.
You may be able to reduce the frequency of such dreams by daily masturbation. Once you have shot your load, there is little need for the body to go on to autopilot to drain you.
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