so glad you took the chance and posted! nope, you're not alone.
i'm a therapist, and it's not uncommon that those in the therapeutic world are ignorant of c-ptsd. i've been doing this for over 25 years, and never heard of it until i was able to see if for myself in myself. c-ptsd is not a recognized diagnosis (like ptsd) in the Diagnostic and Statistics Manual (DSM), which is basically the therapist's bible, so it's unfamiliar to many therapists. that doesn't mean it doesn't exist. i know it does. sometimes therapists will use a diagnosis of something like 'developmental trauma disorder' instead of c-ptsd. i do hope that your therapist will do some research, though, in order to get familiar with the particulars of c-ptsd.
in the meantime, i hope you find support here. i have found this forum to be extremely helpful, with kind, generous, caring, and supportive people involved in it. this was a big step, and i'm happy you took it. welcome.