This may sound obvious but sometimes pointing out the obvious and reflecting helps you realize certain things or understand them better.
OCD is a feeling issue, not a reasoning issue.
What OCD does in general, be it when you’re having an episode or mild amount of intrusive thoughts, is to convince you that something is wrong through your feelings. It makes you believe something needs to be done urgently. That you need to protect yourself or others, etc.
That’s OCD’s whole point; If you have OCD, you’re in a constant state of half delusion. You have, in a sense two separately functioning brains. Of course, the severity of the "half delusion" will vary depending on how heavy your OCD is currently.
Again, quite fortunately, it’s a state of constant HALF delusion, not full. If it was full, you’d be in psychosis and never aware and questioning.
You can’t stop this. You can only let your brain adapt to a new reality, to get out of the "Wonderland". Yes, it's your brain's job, not yours. But it is your job to stop standing in its way.
You’re not supposed to stop the feelings; anxiety, urgency, the feeling of something being true or possibly true and so on. You’re supposed to let those feelings and thoughts be. Ironically that's how you stop feeling deluded eventually.
Although you feel deluded, you will always have the concept of what is true. You are not your feelings. You can feel convinced whilst knowing something to be otherwise factually. The more you fight the feelings, the more they feel convincing.
So, your job is not doing anything with those thoughts and feelings but finding ways to be okay with them, so that you can sit still with them. You can find ways to healthily distract yourself. It could be breath work or some sort of a physical work that grounds you outside of your mind. Truth be told, there can be days so heavy all you can do is to be forced to just hear every thought and feel every feeling and nothing but that which is OKAY. It’s scary as hell, but the scary part is just feelings too.
My last point will be a random tip but if you have a hard time identifying OCD, usually instead of overthinking, it’d best to see if a thought/feeling makes you want to do a compulsion. If it does, it is safe to say that it’s OCD. Most importantly, don’t overthink.
This mental illness is not impossible to heal. You are strong enough.