What Causes Bubbles In Urine?

Sir i am 19 years old boy , i am masterbursting till i m 16 Sometimes i masturbursate 4/5 times a day now i am trying to stop that . i goes to Gym daily to regain my lost power . i drink 3/4 glasses water daily but now when i urinate i can see tiny bubbles with the urine is this any problem ?