What is Seeking Reassurance?

Hello! I just got diagnosed with OCD a week ago and joined the app today to find a sense of community. Since my understanding of treatment is minimal at this point, I'm confused why everything on here tells us not to seek or give reassurance? If someone could explain the reasoning behind that it would be greatly appreciated, as I want to make sure I'm not only watching out for it in my personal life but also using this app appropriately.

When I was a child, before I knew this was OCD, I struggled with constant "magical thinking" compulsions (don't step on the crack or mom's back will actually break, etc). When I later learned this was OCD, it almost immediately solved it. Any time I got a magical thought, I would say to myself "that's just an OCD thought. ignore it." and it just stopped coming! Like seriously it fixed the magical thinking stuff forever. But of course the OCD has resurfaced in other ways. So naturally, I've tried to use the same strategy since I had so much success with it previously. But I wonder sometimes if telling myself "that's just OCD" is almost functioning as a reassurance compulsion? I hate how meta this gets. For example, I have ROCD that comes and goes. So sometimes I'll get a thought like "what if i'm still in love with my ex?" and then I'll tell myself "that's obviously just an ROCD thought" and will feel relief, almost like reassurance. But it comes back. So is telling myself that it's OCD a reassurance compulsion ?? It's just so weird because it worked so perfectly as a kid with the magical thinking thing.

Has anyone experienced their reputation affected or misunderstood because of a societally taboo OCD theme? Others catching wind of your obsessions and misinterpreting it, assuming the worst? I’m intentionally keeping it vague because I don’t want my specific situation to get reassured, but it’s been a real tough pill to swallow knowing that people close to me (and anyone else they might talk to) think of me differently. I’m unwilling to share about my OCD because I feel pretty confident it will be taken as an excuse or denial, and feels compulsive and reassurance seeking. Let me know if anyone here has experienced anything like it, how they handled it, exposures you did.