Your question is rather vague, so I'm going to have to guess in order to answer you. Self-pleasuring doesn't "cause" you to orgasm quicker. However, if you get into the habit of coming quickly during self-pleasuring, your body can get used to this pattern and respond rapidly. The way to "unlearn" this is to slow way down during self-pleasuring. Each time you feel yourself getting close to orgasm, stop and breathe, and allow yourself to come down a bit before starting again. This will give you more control.
Foreskin: when you're younger, it may cover the entire head of your penis; however, when you complete your final growth spurt, your "adult" size penis may be a bit bigger, and the foreskin won't provide as much cover. Nothing to worry about. Dr. J
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