I experience pain in urinating especially at the last part. what could this be?

Here are some ...: Your described voiding discomfort is called terminal dysuria suggesting the inflammation of prostate urethra. To verify the suspicion requires the combo of analyzing detailed Hx stressing the quality, quantity, & sequence of events of all symptoms, conducting proper physical exam including DRE (digital rectal exam), and testing urine from properly collected specimen so to define the cause for Rx..