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in·se·cure
/ˌinsəˈkyo͝or/

adjective
1.
not firmly fixed; liable to give way or break.
"an insecure staircase"
2.
not confident or assured; uncertain and anxious.
"a rather gauche, insecure young women"

Mina has always tried her best, Despite being insecure and unsure of herself. Mina was in a constant state of anxiety and insecurity. Until she met Chaeyoung.