insecure [ˌɪnsɪˈkjʊəʳ]
adjective
1 (not confident) inseguro
to feel insecure sentirse inseguro; he feels insecure about their relationship se siente inseguro acerca de su relación; she feels insecure about sharing her flat with somebody else le preocupa la idea de compartir el piso con otra persona
she is insecure about her performance as a mother duda de su habilidad como madre