justwannaaskaquestion I am so sorry what happened when you were 14 and when you were at school at 10/11 were both sexual assault. Your father and your teacher have failed you horribly by not believing you.
"I wonder what it is about me that invited such weird behaviour from men? "
NOTHING, it is not about you, it is about the man/boys. The victims of sexual abuse are ranged from young children to old ladies, rich and poor, black and white, all religions and groups. It is nothing to do with you and everything to do with them.
Your opening post minimizes the bullying, "... I was bullied at primary school- silly things like name calling, exclusion, trying to pull my pants down etc."
Those aren't silly things, they can be soul destroying. Plus "I may have Complex PTSD and I agree but that was to do with growing up in a family where my father used violence on us."
I think you need some very good counselling for Complex PTSD if that is what your doctor has diagnosed or whatever your doctor thinks.
Have a read up on some things that are offered on the NHS and speak to your GP. I have read good things about EMDR but have no experience of it.
www.nhs.uk/Conditions/Post-traumatic-stress-disorder/Pages/Treatment.aspx
EMDR is mentioned here on the NHS
www.nhs.uk/Conditions/Counselling/Pages/Talking-therapies.aspx
and in this article...
EMDR Therapy: Why Looking Left-To-Right Repeatedly Could Banish Traumatic Memories
BUT I am not a doctor and have no idea if this is right for you. I did have CBT for anxiety almost 20 years ago and it was very helpful and banished my anxiety. I also have OCD as a teenager, which I never got sorted and which morphed into an eating disorder, which I am now having counselling for.
I have not had any experiences like you and I am so sorry you have suffered this. I'm a Christian and not all Christian believe or think like your dad, who sounds awful. I am so sorry but I hope, sincerely, that you will get the help you need. 