How do I cure my OCD?

No.13764914 ViewReplyOriginalReport
> Watch a documentary
> See a homeless person in the background
> Feel disgust for his situation
> "I've looked at a homeless person. I have to undo it otherwise he will have the ability to steal all my money by changing the fate"
> Go back 5 seconds earlier in the video to watch him again and undo the curse
> "Oh no... I feel like it didn't work. I should do it again."
> Repeat the operation for 47 minutes
> Mental breakdown

I do that with basically everything. For example I stop writing at university because I am so tired of writing/erasing/rewriting. When I try to ignore my intrusive thoughts, I end up being so scared that my heart feels like exploding. How do I cure myself?