I'm afraid to let my emotions show.

　　我不敢表达自己的感受。

　　I can't express my anger.

　　我不敢表现出不高兴的样子。

　　I can't say no.

　　我不会拒绝别人。

　　形容一个人内向，怎么说？

　　She is introverted.

　　她很内向

　　I'm very shy by nature.

　　我天生害羞。

　　Everyone thinks I'm an extrovert, but in fact I'm very shy with strangers.

　　大家都以为我外向，其实我看见陌生人很害羞。

　　She's not an outgoing person.

　　她不是外向的人。

　　She is unambitious.

　　她没什么野心。

　　He always wears his heart on his sleeve.

　　他的脸简直就是个晴雨表。

　　I wish my girlfriend didn't wear her heart on her sleeve all the time all the time.

　　我希望女朋友不要总是阴晴不定。