Welcome!
I was diagnosed with borderline personality disorder as a teen. (my first husband, who I married at age 19 and was 12 years older than I, was a Fundamentalist Christian and I was never allowed to see mental health professionals......so I didn't see another one until I was in my late 20's). I have been given the bipolar II diagnosis a couple of times since 2007 and a recent "visit" to rehab to address my 17 year addiction to alcohol gave me the diagnosis of C-PTSD (as well as that pesky BiPolar II dx). I too was abused terribly as a child. I was never bullied, but my first husband was abusive, especially mentally and spiritually. I will never attend a Christian church again. (I have gone to a couple of Catholic weddings and funerals....but I have never walked into a Baptist/Methodist/non-demonimational (especially one of those) since I left that evil man in 1987. The "trauma" has even been recent......just 2 months ago and before that, in May when I found out my adult children were "together"....yes...THAT together.
At any rate, enough about me. I am 51 years old and have lived with this a long time, it seems. I cannot speak for you, but DBT therapy has been SLOWLY helping. MY problem has been with my emotions.....according to my therapist, I "intellectualize" my emotions...there is a name for it (and I am too lazy to get up and look), but I take a really long time to come down from emotions....especially anger...I hold grudges a very long time....am a bit anti-social, (I used the alcohol to become more fluid in social situations....) and always think the worst of people....like you mentioned: a lack of trust.
I have heard we have a hard to deal with, (in a therapeutic manner), condition. I know the BPD is, of itself, a very difficult condition to have and "treat". Just by coming to a website and "talking" about it, is a step.
Hopefully I "meet ya again" in another conversation. (Sorry this post was a lot about me.....but I don't know you , yet....and I can only speak from my experiences.....) Hope you have a beautiful day! :)