Coming out

So recently came to the conclusion I’m trans (had the thought for yes but been in denial, still kinda am) and I told one my uni support people (idk her official title) and she asked me if it was alright to tell the teachers (just the core staff not freelance yet) and I agreed but now I’m kind of regretting it. Yes I want to be called Ivy, yes I can’t stand my dead name, but I can’t come out to everyone no matter what, I can’t talk about it in person as I freeze up. I’m scared the core staff will refer to me as Ivy from now on which is what I want but I also don’t, there are few other people in my year who I have told but not many. I’m just so confused in what to do, do I message the uni support person and be like I changed my mind or follow through with what I said as I’m dying to be known as Ivy.