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が苦手なの

to be not good at something

→ が
phrase Uncommon #17,945
to be not good at something Use が before the thing or activity someone has difficulty doing. The の adds a casual explanatory tone.
JA: 私、人間関係が苦手なの。
EN: I'm not good at relationships.

トムは踊るのが苦手なのよ。

Tom isn't good at dancing.

絵が苦手なの。

I'm not good at drawing.

私、人間関係が苦手なの。

I'm not good at dealing with people.

トムは人の名前を覚えるのが苦手なのよ。

Tom is bad at remembering people's names.

絵を描くのが苦手なの。

I'm not good at drawing.

彼女の娘さん、料理が苦手なのよ。

Her daughter isn't very good at cooking.