my heart breaks for you. You've been thru the mill. I want to reassure you that transference, looking for mother figures is sooooo normal it's unbelievable. Lots of people who've have their childhood interrupted experience this. And the one person who can and should do this for you somewhat is your therapist (providing she understands attachment theory and trauma.)
There's a lot of grieving to be done too for all the things you should have got from your parents but didn't. You have a long road ahead of you and it isn't quick and definitely the hardest thing you'll do but it's so worth it and you can feel better but you will need to stick with the therapy and not run away from it. Take care x