@HotWheels@actuallyautistic Sounds odd, maybe, but I've had some success changing my mindset about myself by making a point of mentally complimenting random people I pass. It creates a world in your own head where you can focus more on the positives.
Like "that's an awesome coat", "I love that person's tattoos", "that skirt is such an unusual colour but goes so well with that bag", "that's such a smart hairstyle", you know, simple things.