Inferior

/ɪnˈfɪərɪə/

lower in rank, status, or quality. "schooling in inner-city areas was inferior to that in the rest of the country"

Inadequate
/ɪnˈadɪkwət/ lacking the quality or...

Insecure
/ˌɪnsɪˈkjʊə,ˌɪnsɪˈkjɔː/ (of a...

Fearful
/ˈfɪəf(ʊ)l/ Feeling or showing fear...