Is it normal

is it normal for period to be 4 days late without being sexually active.. just masterbation but I only did that onced I used to when I was little except I didnt know what I was doing

Masturbation has nothing to do with your mestrual cycle. Some women have irregular periods until they are in their late twenties. It is perfectly normal. If you want it to be predictable and on time, check into some hormonal options (IE birth control pills) they will help regulate your periods.

yes this is very normal!