You need to concentrate on the speed of masturbation .You got think of what ever helps you the most to get through masturbating. Always relax, don't be in hurry. Make sure you're well rested.
I have been masturb*ting for a few yrs but it never lasts long. When I do it I only last a few seconds cause the feeling becomes intense. I only do cl*t stimulation. It never feels good to me as it probably should. Am I doing something wrong?