You need to see a Urologist.
The prostate continues to grow throughout male life. As you age, the prostate's growth gradually chokes the urethra, through which urine passes, making urination difficult. Prostate also impinges on the two sphincter muscles which control urine flow from the bladder to the urethra.
Benign enlargement of the prostate can be treated with relatively cheap generic drugs, effective for years.
There is a small chance the prostate is enlarged because of cancer. During a first visit, a Urologist will conduct a number of tests, starting with an uncomfortable digital exam of the prostate through the rectum, to evaluate the low possibility of cancer. Urologist will also order blood tests in order to monitor Prostate Serum Assay (PSA). A PSA of 0.00 to 4.00 is considered normal. Above 4.0 or an abrupt change in PSA level from normal reading established over time, is an indication of adverse change. Male family history with prostate problems is also relevant.
The prostate is deep within your abdomen, where the urethra joins the bladder. Very few men know their anatomy. Research prostate on Google so you understand the anatomy.
Whatever the cause of your problem, mostly likely simple aging of the human male, difficulty with urination will inevitably grow worse. Seek treatment. If you delay, surgery to remove part of the prostate is the alternative. Prostate surgery is NOT a minor operation. You do not want prostate surgery if treatment NOW with drugs is the simple and effective alternative.
Prostate enlargement is not treated by family physicians nor Internists. You need a Urologist.