When did you start using the title "Founder" on your public/professional profile?

I am grappling with the idea of when I should include "Founder" title in my profiles (LinkedIn, Twitter summary, etc.). It's an exciting idea and something I have been looking forward to since I first decided to build my project and see if I could make it successful.

My MVP is fully functional and live on production. I don't 'have any users yet because I am still seeding my data and trying to get a few people to write reviews (it's a review site). I haven't started to promote it at all because I want to have at least a few reviews left by users before I start really pushing marketing out.

I wasn't planning on publicly saying that I was a founder until, I don't know, it felt more official? Or I actually got a handful of users? Kind of arbitrary, I know.

Maybe it's fear of publicly failing or the constant imposter-syndrome (this is my first IH project and this is all new territory for me) that is holding me back from touting that I actually founded a thing.

Anyway, I was wondering how other Indie Hackers approached this. So my question is this:

At what point did you start using the title "Founder" on your online profiles?

No judgement here. I understand it's a personal decision and will vary from person to person. I just want to hear other perspectives that will maybe help me decide when it makes sense to embrace the founder title.

Thanks, all!