Struggling to manifest physical changes

Hi! So I’m using a throwaway account for this because my family knows my normal account, but for a few months now I’ve been trying to manifest some physical changes. (Decreased height, lighter skin, slimmer hands, etc.) I’ve listened to subliminals, done the method of pretending it’s already done while I’m about to fall asleep, etc. but I still haven’t noticed any changes. I’m trying to change my thoughts but i often still catch myself thinking ‘this won’t work’ and stuff like that. I love myself how I am, but I’d just like to figure out how to manifest these things.

Anyone who has succeeded, please leave tips down below. Anything is appreciated. Thank you!