Is it just me or does anyone else also doubt the fact that they have OCD even if they know for sure that they do have OCD and have been diagnosed various times??

The "good enough" approach is what's worked for me in the past. Your doctors say you have ocd. That's good enough. what's happened is your ocd is fooling you into thinking it's not good enough, that you NEED some kind of 100% slam-dunk certainty. But that kind of certainty doesn't exist, and you don't need it anyway. It might seem scary at first, but it's ok to live with a tad bit of uncertainty, to say "good enough" and then move on.

Obsessing about whether or not you have ocd is kind of ironic if you think about it? Like, of course that's what someone who DOES have ocd is going to do!! But really, your thoughts and feelings aren't always a good guide to reality. A professional who gives a diagnosis is going to have a pretty good idea. I mean, you could alwaysdoubt the professional, but at some point you just have to say "good enough" and accept the uncertainty past that point. diagnosis from a professional is certainly "good enough"

I was diagnosed with OCD by three different psychologists and one psychiatrist and I still constantly fear that i actually dont have it and just made it to justify my horrible thoughts :/ i think is very common to feel like that

This is very common

yup, very common.

I was diagnosed but sometimes I feel like the things I check and count aren’t irrational at all, they’re like HYPER rational, which makes me think I don’t actually have it, I just pay a lot more attention to certain things than others. But then I get assured by someone that’s what they mean by OCD; but I don’t get what’s wrong with it if it’s just rational, so it throws me

I feel like this. I have all the symptoms but then I try and tell myself that I don’t have it. But I have it for so long now. I’m seeing someone today to get professional help.