BPH or benign prostatic hypertrophy/hyperplasia is the non-cancerous enlargement of the prostate gland.
It is unlikely that you would have BPH in your 30s. Most men start to get enlargement of the prostate in their late 40s and early 50s. Common symptoms of BPH would be what we call lower urinary tract symptoms (LUTS). These include slow urinary stream, straining during urination, sensation of incomplete emptying of the bladder, frequency of urination and waking up to urinate after going to bed at night.
Having lower urinary tract symptoms does not mean you have BPH. Lower urinary tract symptoms in younger men can be caused by other conditions. Do make a trip down to see a urologist.