My masturbation doesnt work.?

I am a 14 yeard old man. When I masturbate, I pull my hands up and down on my . Then withing like 20 seconds urine comes out. So next time I went to the bathroom before I masturbated. This time within 30 seconds my body sort of feels like it is peralized. So I stop then I cant keep on going because it doesnt feel as good as it did when I started. Do you know what I am doing wrong or do you have a nother technique? Please comment.