relaxing problem, help me?!

i am 28 with two kids. i and my husband have a good sexual life. we spend good time to have sex, but i dont know why i dont get relax.. i mean like he feels dischargment i dont feel any kind of relaxatoin.as he spent good time on me, as he is good man, i love him so mch. what do i do..help me advice me, even when i do masterbate some time to check my discharment or relaxation point, i never get that point and become more upset....??????????????