The human body undergoes a growth in adolescence and this continues till age of 21.
As you are 18, there is till a chance to grow, but this growth is overall body growth. If you have well balanced diet rich in proteins and do regular exercises, you can make yourself more fit, attractive and also help your body grow to it's full potential
you have not written about the size of your penis.
If it measures anything more than 2 inches, in erect stage, then there is nothing to worry about
the average size of penis depends on the genetic background of a person. So it is fixed and can not be grown as one wishes!
it would be better to concentrate on what you can do with a panis than worry about it's size.
If you masturbate, it's normal,
at masturbation you can learn to control your ejaculation and this can help you relieve sexual urges and also learn to last longer in bed.
The penis head is richly supplied with nerves and they carry pleasurable sensations of touch to brain which causes the brain to send more blood flow to the penis and cause an erection.
Ejaculation time is dependent on your excitability and if you get extreme excitation, you ejaculate fast. So it is better to get" taught" about how to delay ejaculation by doing an exercise at masturbation.
Every man know that during ejaculation there is a point when the ejaculation can not be stopped even if sex or masturbation is stopped. This is the point of ejaculatory inevitability.
At masturbation, go to this point of ejaculatory inevitability, and just before that press the penis head at the neck, using two fingers. This pressure must be for 1 minute and also firm enough to cause some mild pain. If successful, the pressure when released will show that ejaculation has been stopped.
Repeat this till you can maintain ejaculation for a good 15 -30 minutes, be repeating the process. If you can master this, it will improve your ejaculation time at masturbation and at sex.
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