How long does it take for an untreated bladder infection to make a teen male infertile? i've been having a bladder infection for a year and a half :/

UTI: Uti in men, unlike women, is often due to some anatomic or physiologic abnormality of the urinary tract or the immune system and this needs thorough evaluation by a urologist. Why this has gone untreated for this lengthy time period needs some explanation, but whether this will in any way affect your fertility will depend upon what structures were involved in the infection. See a urologist asap.