I'm so sorry that you were forced to go through those awful things 
Being an abuse survivor makes us do all sorts of things to cope, that later we look back and wish we'd done things differently, but it's perfectly normal.
I can't help thinking that you may have PTSD from the sound of it? If you do an online mental health referral and describe to the HCP who will then get in touch how you feel, you can access councelling and EMDR therapy on the NHS.
Also if you contact your local Rape and Sexual Abuse charity you can ask for specialist councelling to do with the specific events you've described. They may also have a support lined you can call to talk to someone.
Please don't feel ashamed or worthless, you are not! You can ask for help and you can feel better.
I finally asked for help for the effects of childhood abuse and then rape as an adult, more than 40 years after the events took place.
It's been hard work sometimes, but my life is so much happier now I've talked everything through, got it all out into the open, had therapy and faced what happened.
But do seek help and find a councellor and tell them everything about the past. Its amazing how much better just telling someone, can make you feel.