I am 13 years old and I am late on my period but I am still a virgin?

This is normal.

Anything up to 7 days variation from your normal menstrual cycle is normal, but even if it is later than this it's still absolutely fine because irregular cycles are normal at your age - your body may not be mature enough to ovulate regularly thus you will not menstruate regularly, and as your body is changing this can effect your menstrual cycles too. Don't expect regular cycles until you reach adulthood.
This is normal.

Anything up to 7 days variation from your normal menstrual cycle is normal, but even if it is later than this it's still absolutely fine because irregular cycles are normal at your age - your body may not be mature enough to ovulate regularly thus you will not menstruate regularly, and as your body is changing this can effect your menstrual cycles too. Don't expect regular cycles until you reach adulthood.