I can remember even as a child not feeling like I was good enough, even with friends I had and outside of the abuse. Then again, I never remembered the abuse for a long time, so it could have been linked then too.
There are a lot of situations that trigger low self esteem and self worth for me. For example, I isolate a lot either because of anxiety or I do not want to be triggered (doesn't always work 100% obviously), but when I see someone who is able to go out and do a lot, especially be able to meet new people, work outside their house, etc., that makes me feel like I am not as good or good enough because it feels like a slap in the face almost. It brings up a lot of shame and sadness because I realize I am missing out on so much, so that causes my self esteem and self worth to go downhill.
That is more true for dating/relationship thoughts too. That is another thing that makes me feel just harsh because it's another thing that reminds me what I missing out on, and then I feel like I would just be a huge mess for someone to deal with when triggered, trying to explain things to them, etc.
I think PTSD/CPTSD do create a lot of self esteem/self worth issues even with the simplest things because there is so much shame too.