In most cultures, virginity is not "lost" until you have penetrative sex with another person.
Masturbation is perfectly healthy, normal and natural. It does not cause any harm, and has many health benefits.
Your period may be late for any number of reasons, and you are still within the normal range for a woman's cycle (between 21-35 days average). Late periods can be attributed to recent illness, excessive stress or worry, new medication or medical condition. If you have no symptoms, wait and see if your period begins within the next week. Let us know when it starts!