While girls lack confidence , boys often overestimate their abilities.

女孩通常缺乏自信，而男孩则往往会高估自己的能力。

Others lack confidence because of the high school bully factor.

另一些人则因为受过高中校园欺凌而缺乏自信。

He is good but seems to lack confidence.

他很不错，但似乎缺乏自信。

It's likely that you just lack confidence.

你可能只是缺乏自信。

Only those who lack confidence fear opposing views.

只有那些缺乏自信的人才害怕不同有的观点。