cannot ejaculation and reach orgasm during making love but i can when I pleasure myself

iam avirgin husband i cannot reach orgasm except by masturbation i stopped masturbation for 2 month but i still cannot reach orgasm with my wife and also i cannot  ejaculation  i know that is called delay ejaculation  i want advice or awebsite to know more about atreatment  iam 30 old and i am not sick