For where you are and how you feel always use estar
if you are characterizing someone use ser
example: yo soy timida y yo estoy bein
¿Creo que podría ser aguda?
Answer:
"The Shadow of the Wind is a 2001 novel by the Spanish writer Carlos Ruiz Zafón and a worldwide bestseller. The book was translated into English in 2004 by Lucia Graves and sold over a million copies in the UK after already achieving success on mainland Europe, topping the Spanish bestseller lists for weeks.- Wikipedia"
Explanation:
