Hiv phobia/ anxiety. Actual hiv status.

Can hiv hide to tests(antibody or rna pcr) for more than 4,5 years some are writing articles in google with proofs that in rare cases hiv can detect positive after exposure of 4 to 7 years,till then it comes only negative even virus present in the body ...is it possible to take that many years to seroconvert ...if its is possible in any case how to identify a person is late seronegative patient when he is not having any hiv simptoms...what are the tests to do to confirm his actual hiv status..(though he is getting negative results)...please kindly any doctor explain me this please ...iam searching for answer to this question for over 3 years still i dint get it...and this doubt made me hiv anxiety sufferer..please any kind hearted doctor clear this doubt (if possible with small explanation to make me understand) and make me to get out of this dirty phobia please save my valuable years ahead...iam wasting my time because of this...thanq so much for all doctors who read this ...