I am a little timid and lack of self-confidence.

我有些胆小，缺乏自信。

youdao

Tortoiseshell cats usually have a good temper but are a little timid and shy.

玳瑁色的猫通常脾气很好，但是有点胆小害羞。

youdao

The little girl is as timid as a hare, shy in the presence of strangers.

这小姑娘胆子特别小，怕人。

《新英汉大辞典》

Fortunately the press has recently proved a little less timid than the politicians about the role of the armed forces.

ECONOMIST: A survey of Turkey