Please advice

Patient: Hello doctor,I am facing an issue and I am not sure whether I should be concerned about it. Please advice.I am recently married and I am having sexual intercourse. I feel a difference while my penis arouse and I have intercourse. The ejaculation is not happening when I have an intercourse. How long will it really take to ejaculate with a fully aroused penis. I tried maturbating and I get the ejaculation in few minutes but not the same during intercourse. What should I do to overcome this. Please advice. Thanks.