YOU SAID:

I need to go now because I have really bad anxiety about being late.

INTO JAPANESE

遅れてしまう不安があるので、今すぐ行かないといけない。

BACK INTO ENGLISH

I have a concern that I will be late, so I have to go now.

INTO JAPANESE

私は遅れるのではないかと心配しているので、もう行かなければならない。

BACK INTO ENGLISH

I am afraid of being late, so I have to go now.

INTO JAPANESE

私は遅れるのが怖いので、もう行かなければならない。

BACK INTO ENGLISH

I am afraid of being late, so I have to go now.