YOU SAID:

The party doesn't start until I walk in

INTO JAPANESE

私が入るまでパーティーは始まらない

BACK INTO ENGLISH

The party doesn't start until I come in

INTO JAPANESE

私が入ってくるまでパーティーは始まりません

BACK INTO ENGLISH

The party won't start until I come in

INTO JAPANESE

私が入るまでパーティーは始まりません

BACK INTO ENGLISH

The party won't start until I come in