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が苦手なんだ

be bad at; not be good with

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phrase Rare #21,881
be bad at; not be good with Used to explain or emphasize that someone is not good at something or feels uncomfortable dealing with it. The subject is often understood from context, and なんだ adds an explanatory tone. The polite form is が苦手なんです.
JA: 私は人前で話すのが苦手なんだ。
EN: I'm not good at speaking in front of people.

子供の扱いが苦手なんだ。

I'm not good with children.

トムはトランプが苦手なんだよ。

Tom isn't good at playing cards.

ねずみが苦手なんだよ。

I can't stand mice.

トムは血が苦手なんだ。

Tom can't stand the sight of blood.

謝るのが苦手なんだ。

I'm not good at apologizing.

トムはフランス語が苦手なんだ。

Tom isn't very good at French.

トムは縦列駐車が苦手なんだよ。

Tom isn't good at parallel parking.

トムは自分のこと話すのが苦手なんだと思う。

I think Tom has a hard time talking about himself.

トムは数学が苦手なんだよ。

Tom is bad at math.