LOL! It'd be really funny if I was, in fact, younger than you.
Anyway, random bit of general advice is to don your character's skin. Imagine yourself entering the world you wrote as your character, feeling the restrictions of the body you gave your MC, moving around with genuine wonder. Note down everything, every emotion you feel at every scene, and experience it with more vividness and realism than the real world itself. This will truly help write a world that will bring the reader with you. You need to cover how hands move around by moving yours within the world, how things feel to your touch, and how you react to touch. Are you pressing your fingers into your tender arm with stiff, frenetic scratches, or are you lightly squishing your skin with a comforting grip because you are embarrassed as all get out by a crush? Don't forget to cover how the world actually looks and make it impact the world. Buildings and how the MC describes them (negatively, positively, curiously, etc.) can influence how the reader sees their personality, flesh out the world, and increase culture. This stuff applies to the other three senses, but I think you got the gist.