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 quantity required; insufficient for a...

Insecure
/ˌɪnsɪˈkjʊə,ˌɪnsɪˈkjɔː/ (of a person) uncertain...

Fearful
/ˈfɪəf(ʊ)l/ Feeling or showing fear or anxiety. "they are fearful of the...

Emotions Wheel
I have enjoyed working with the emotions I found in Plutchik, but there are so many more...