YOU SAID:

i am very cool and fun and good at things

INTO JAPANESE

私はとてもクールで楽しく、物事が得意です

BACK INTO ENGLISH

I'm so cool, fun and good at things

INTO JAPANESE

私はとてもクールで、楽しくて、物事が得意です

BACK INTO ENGLISH

I'm so cool, fun and good at things