@Yaujta
I stressed on word teenager cause that's the learning period of everyone's life. No one is born with manual of how to live one's life. Being a teacher to age group of 14-17 years old, I can see them developing from bird eye view. Everyone has different way and mean of learning.
Pride, insecurity, empathy or over thinking, or worse combination of all these, can stop ppl, teenagers or adults, from expressing themselves. Tsubasa has been through a traumatic experience as a child, that may have been causing her to overthink and be indecisive in general.