PTSD Imposter syndrome?

Is there something like ptsd imposter syndrome? I Know with cognitive logic that what I went to that I have ptsd. My therapist even said so. We did scan the all the criteria in the dsm 5. but it still feels like I'm faking. That it isn't bad enough?

4 therapist 5 years ago told me that what I went through couldn't give me ptsd. And that is still in my mind?

My grandpa used me to make child porn from age 4 to 14 he raped me, tried to shoot me, he stabbed me, he he strangled me, kidnapped me and hold me hostage for years. I have seen multiple murders, seen people kill themselves, seen war, human trafficking, and so much more fucked up stuff. But there are people that have seen much more and worse than I have.

2 months ago I got raped again and I felt noting my ptsd symptoms did not get worse?