@KuroiRyuuga
That emerged from Low Self Esteem 
 
allow me to explain 
 
If you read the first page, from Chapter One, you will see that the expression that is reflected from White Mage~san face 
 
 
with her eyebrows turning downwards as soon as she removes her hood,  people will arrive at the conclusion that she is scary 

 although she is.................. as you stated in your own comment, and i quote " She was painfully shy for half of the first chapter" 
this happen because, if you read further, she has been deemed by people who, she has met before the story started, to be scary because of her face 
 
And they also mock her, by saying that she appeared more as a mage that uses Black Magic 
 
So imagine, after being mocked and rejected continuously when she wishes to join a party,
Low Self Esteem will play it`s part  
 
Thankfully, all of that is in the past, where she is now changing, for the better, i am glad for her 
hope this helps 
