YOU SAID:

im scared someones gonna walk in

INTO JAPANESE

im は誰かが中に入る怖がった

BACK INTO ENGLISH

im scared of someone going in

INTO JAPANESE

誰かが入るのが怖いim

BACK INTO ENGLISH

im afraid of someone entering

INTO JAPANESE

誰かが入ることを恐れてイム

BACK INTO ENGLISH

im afraid that someone will enter

INTO JAPANESE

誰かが入ることを恐れるイム

BACK INTO ENGLISH

im afraid that someone will enter