Dear manishmaddy16, Few people are unable to reach to climax through
masturbation as they are unable to fully concentrate on pleasure part of masturbation, nothing to worry.... pain in buttock may be due wrong posture or vigorous shaking it is again not a major issue if only related to masturbation. as in this age group semen production is optimum it is quite natural to have night falls . finally don't worry you are pleasurably NORMAL MALE....