I’m not sure I can help really, but just wanted to say you aren’t alone in feeling like this. It’s exactly how I feel.
Something that helps me sometimes is to remember how much I think you shouldn’t just give up. It remind me that when I made the decision to leave I must have been in a really bad place, as otherwise I wouldn’t have done it.
Not even sure that makes sense, but I hope you feel more sure of yourself soon xx