HOW TO EXPLAIN GAP IN RESUME?

I DID MY BACHELOR IN CHEMICAL ENGINEERING BUT DUE TO MY FAMILY, I COULD NOT LEAVE THE HOUSE TO WORK. BUT I MANAGED MY HOBBY OF WRITING TO WORK AS A CONTENT WRITER FOR A WEBSITE AND WITH THAT EXPERIENCE I GOT INTO AMAZON AS AN AFFILIATE REVIEWER. THIS DOES NOT MATCH WITH MY B.TECH AND I AM PLANNING TO GO TO MASTER IN MATERIAL SCIENCE A PART OF CHEMICAL ENGINEERING. PLEASE HELP ME SORT THIS OUT??!!