Hopelessness is a terrible feeling, and I completely empathize with you.
I would try not to think of it as OCD "preventing" you from obtaining peace. The reality is, life is a series of ups and downs. There are moments of suffering and moments of peace for everyone. There is no such thing, and I mean NO such thing, as a completely peaceful life. Even someone who has no mental "disorders," all the money in the world, and all the friends/support in the world, experiences suffering. To put it bluntly, we ALL crave peace.
This is the one place where I feel like the whole "treating OCD like a separate 'thing' in your head" strategy becomes counter-productive. It's not some parasite that's permanently latched onto your brain, preventing you from being happy or peaceful. You aren't defective or broken.
You are just as capable of feeling peace as anyone else with a brain, you just have to learn the ways of getting there. How each of us finds peace is unique to ourselves, our conditions, and our situation.
What I've found is that by working with OCD, learning about it, and learning how the mind works, you gain tools that are incredibly useful for everyday life. We are learning to sit with extremely uncomfortable feelings rather than avoid them. We are learning AWARENESS. People underestimate just how powerful that is. Everyone should be learning how to do that, not just people with OCD.
Most people float through life by distracting themselves and avoiding suffering as much as possible. We are facing it head on. So when it comes time to face the inevitable and universal sufferings in life, like old age, sickness, and death, we will be better prepared. We will have more clarity, and yes, more peace.
Be aware of both the positives and the negatives in your life, and the positives will be that much sweeter.
Hope something in there is helpful.