YOU SAID:

I do not have fun at large party's

INTO JAPANESE

大人数のパーティーは楽しめない

BACK INTO ENGLISH

I can't enjoy large parties

INTO JAPANESE

大人数でのパーティーは楽しめない

BACK INTO ENGLISH

I can't enjoy a party with a large number of people

INTO JAPANESE

大人数でのパーティーが楽しめない

BACK INTO ENGLISH

I can't enjoy a party with a large number of people