I'm really sorry Lostinthere, I am struggling badly with this too and have fallen deep into the same pit of self hate and lack of self worth that you refer to. it's so easy to fall into this, but so so important to try hard not to.
Personally, and this is just my own attempt to make sense of my world, I try hard not to define myself by any single thing, and particularly not by any task or external role that I can be seen to fulfill. In my view, defining yourself in such a way is attaching worth (or a lack of it) to the tasks that you perform, instead of to the person you are and the person you are striving to be.
I don't know if that makes sense, but defining myself by my job was one of the most ultimately damaging things I did to try to manage my own lack of self acceptance, and losing my job therefore equated to a terrible loss of this self acceptance. The last thing I want to therefore do is to define myself by any new role which could also some day change, and which in no way reflects who I am or where I am at in life anyway.
I am the sum of all of the parts of me - the friend, the trauma therapy client trying to get better, the dog owner, the gym member... etc. In such a way, as these external states of being change and ebb and flow, I will hopefully stay on track with building a self image and concept which is about the person inside and not the person who "does" anything.
Yes, so, so much easier said than done.
Maddog