のが苦手だ

not be good at

→ の
phrase Rare #21,094
not be good at Follows a verb in its dictionary form to say that someone is not good at doing something.
JA: 私は人前で話すのが苦手だ。
EN: I'm not good at speaking in front of people.

私は即興で話すのが苦手だ。

I'm not good at speaking off the cuff.

トムはじっと立っているのが苦手だ。

Tom has trouble standing still.