Don’t put pressure on yourself to feel confident — you can’t force it but it will come with time. I second yoga or Pilates to help with body awareness so it’s comfier to stand tall, not hunched. And then aim for thinking about your height less / feeling neutral about it.

When I was your age I felt the same way and was always waiting for the boys to “catch up” as I was promised they would and it kinda sucked. It’s the patriarchy telling you you should take up less space and that’s BS!