I have to count to 25 when i go into a room or do a task such as eating and use hand sanatiser a lot. do i have a mental disorder?

Possibly OCD..: You may have an obsessive-compulsive-disorder, which is relatively common and not dangerous. Your case seemingly is mild and some cognitive-behavioral therapy may help. Fortunately there are many treatment options for such condition and i would encourage u to consult your doc for an evaulation... Good luck to you..

Maybe: First let me say that "mental disorders" are much more common than most people realize. Further, proper diagnosis for mental disorders--just like most physical disorders--requires a more complete evaluation than just a few sentences. So although the symptoms you're describing may be a sign of a particular condition, i'd recommend seeing your doctor for proper eval and care.