I think before T, I only got a teeny little bit from my first horse who was amazing and made me look better than I was. A one person horse who was very wise and really chose me, and who would do anything for just me. I didn't have anyone else and I wasn't good at anything else. Never tried, failed school, so I really didn't get any self worth from any achievements. I think since T, I've got a little from her, but I can't hold onto it myself at all. T wishes I could. Like recently when she's said so many awful things about me and been really angry at me, it's sort of shattered everything because she was the only thing that reflected back any self worth to me...and now?
Sorry I have no helpful advice! Any advice from me is probably a bit worthless really, since I struggle so much myself. I'd guess that part of it may come from others, but you have to learn to hold onto it, that you are still those things and they don't go away. Also maybe by appreciating and recognising that things that make you you and the things you are good at and like about yourself. One thing, just about the only thing I like about myself is that I do care about other people. I know I felt a little better about myself when I worked in a job where I often helped people and also when I volunteered helping kids. I think if you've often got people reflecting back and recognising something about you that is a good thing, then maybe it becomes a little easier for you to hold onto yourself and have a bit more self worth?

Sorry! Not entirely helpful, I know.