Hi and welcome to the forum! I am glad that I can help you.
You want to know whether a white tissue-like substance after urination is a normal condition.
The urine is clear and more or less yellow colored due to its concentration. Any other changes such as odor, milky urine, pain in the waist, itching while urinating and frequent urination may suggest a urinary infection. A white tissue-like substance in the toilet or on the toilet paper may suggest a vaginal yeast infection.
Given the data that you described, you may be experiencing a vaginal yeast infection. See your gynecologist for further advice and information about diagnosis to rule out this condition.
Please keep in mind that I provide medical information only. I am not able to diagnose medical conditions online. Please contact your doctor or other qualified healthcare provider such as a gynecologist for further advice and information about diagnosis and treatment options.