I finally told to my mum that I need a psychologist, and I selected some that could be ok for me. I just have to choose one and make an appointment. But I'm so scared

I know, I shouldn't...but I'm embarrassed to talk about my problems, expecially OCD (that is the main reason I go for). I've never talked about it in real life. I've fear to go there and not to be able to say what I want. I'd like to can tell it in the first appointment, because if I don't like that psychologist I could change without wasting too much time. But I've fear not to be able

Maybe I'll make an appointment and then I'll regret it and I'll have anxiety all the time waiting for it, though I know that it's better for me.
Have you any suggestions? Do you remember making your first appointment? Was it scary also for you?