Since may ive felt the constant urge to urinate some times strong sometimes light. ive had urine, blood and cystoscopy test but nothing is wrong. it gets aggravated if i lift or if i masturbate. what is this?

Your condition seems consistent with overactive bladder syndrome after a negative, thorough work up. You need to see a urology team which has high expertise in dealing with this condition. Please read this link from Mayo clinic for further info: https://www.mayoclinic.org/diseases-conditions/overactive-bladder/diagnosis-treatment/drc-20355721

In some people there are trigger points which give this urge, which is felt in the brain and do not need to have an anatomic abnormality. To help this, avoid acidic foods and other intake by trial and error, Try to hold urine for a few minutes longer after the urge and increase that gradually, keep busy and try mindful meditation- which is better than taking meds. Good luck. You can do it1