many girls don't have their periods until they are 14, 15, or even 16 years old. so it could be that you are just a little
late. if you are very thin and underweight
or if you are an athlete, that could delay your period as well. the bumps may be just an infection of hair follicles, especially if you shave with a razor. it is impossible to know for sure though without doing an exam. you can try using warm soaks 2-3 times a day, but if thy persist, especially if they spread or grow larger, you should see your doctor. please let me know if you have any more questions.