YOU SAID:

I don't really have fun at large parties.

INTO JAPANESE

私は大規模なパーティーではあまり楽しくありません。

BACK INTO ENGLISH

I don't have much fun at large parties.

INTO JAPANESE

大規模なパーティーはあまり楽しくないです。

BACK INTO ENGLISH

Big parties aren't much fun.

INTO JAPANESE

大きなパーティーはあまり楽しくない。

BACK INTO ENGLISH

Big parties aren't much fun.