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insecure
/ˌɪnsɪˈkjʊə,ˌɪnsɪˈkjɔː/
adjective:
uncertain or anxious about oneself; not confident.
synonyms: unconfident, lacking confidence, lacking self-confidence, not self-assured, diffident, self-effacing, self-conscious, unforthcoming, uncertain, unsure, doubtful, self-doubting, hesitant, unassertive, retiring, shrinking, shy, timid, timorous, meek, passive, inhibited, introverted;