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對(duì)，是having done

不過(guò)你舉的例句不太恰當(dāng)。afraid有兩個(gè)有些接近的意思：
1) 害怕，結(jié)構(gòu)為be afraid to do / of doing。例如：
I'm afraid to swim / of swimming。我害怕游泳。
2) 恐怕...，用于向?qū)Ψ酵嘎秹南⒌取Ｒ话阌肐'm afraid (that) ...的形式。
I'm afraid I wasn't able to finish the task you gave me.
這兩個(gè)意思一般都不會(huì)用到having done的形式。

enjoy后面也是接doing，不會(huì)接having done

thank you for后面也是通常接doing，但要強(qiáng)調(diào)“已經(jīng)”的時(shí)候，也可用having done，但較少見(jiàn)。與此類似的還有I'm sorry for。

having done最常用的用法是作狀語(yǔ)，意為“...之后”，相當(dāng)于after doing。比如：
Having had dinner, I went for a walk.

afraid of的用法

應(yīng)該轉(zhuǎn)化成I used to be happy with playing computer

afraid of是什么詞性

Afriad of 是短語(yǔ)
Afriad 是形容詞