Welcome to HCM.
Are you on ART? Some drugs or even HIV
infection may be the reason that you have not developed muscles like others.
Regarding the sensation of urgency for urination, you approach your physician and present your problem. He/she will rule out urinary tract infection
Mallitus which may be the causes for the urgency. If you have problem it can be corrected easily.
In the absence of these diseases, you have to evaluate your bladder function by a urologist and a neurologist
Nowadays early ART is advisable for all HIV positive individuals.