yes,it is,the age average of female 's period comes around 11-13 yrs old at least,
you should use some sanitary towel and stick it in your underwear to prevent these blood,first you should estimate that how much it flow,then use different size of sanitary towels adequately .
*stick the smaller size one in first day of period ,as it l fewer blood flow,stick the larger size one in 2-4day even at night.
besides,you should notices what food that you should eat,which will affect your health in a long term.i suggest you eat more carrots,tofu,meats,fish,which contains more irons,because blood consist of irons,so irons will lost during the period.
during the period ,you may feel stomachache and headache,moody.
it is very important for female's future reproduction,and easily affected,so eat some healthy foods and vegetables.
don't think that women's period is straight ,it is normal,which is the important part for female growth