These disorders never make sense, hence they are disorders.. It's because you dont do this stuff because you want to, you do it because you try to cope with something else.. like people who lose someone in their life try to get control over it again by cleaning up 100 times a day.. it's not your fault that you do this.
How do you feel if you try to stop doing it?
You can try to just lets say stop it for one hour and the next week for two, etc.
But i think there's a bigger problem behind it, try to work it out with a therpaist.