I never had sex earlier in my life till date but I masturbate 2-3 times in a week, sometimes daily, sometimes 2-3 times in a month but recently when I am with my gf than we start hugs and kisses but not sex ,then I feel pain in my testes, and the pain goes on increasing and it will present for about 30 hours, again second time same thing happens, but in last few days I had sex and I realize that when I am indulging in foreplay than its fully erected but when I try to put my penis into her vagina than its got loosen automatically and I feel embarrassed then I with my hand erect it again and put into her vagina than its got discharged immediately, after 10 minutes I again erect my penis and put into her vagina but again with in few seconds it got discharged, and I feel very embarrassed ,i never had sex earlier but what is this happening to me, I am extremely worried.