너무 and 아주, they both mean "Very or Too" but when do you use them?!
Teeeeeeechnically 너무 should be used with negative adjectives like "Too cold" or "too loud" but its often used now with positive things like "too pretty" or "I like you too much."
But 아주 is always always with positive things^^
You're very nice, really nice, soooo nice, super nice :D
You're too pretty, way waaay too pretty, dangerously pretty, super pretty :D
For negatives, you'd never say:
You'd say 너무 아파 (neo-mu a-pa) because pain is a negative thing!
So basically remember:
아주 - POSITIVE
너무 - Supposed to be negative but can be used in both cases :)