Period Questions!?!?!?

hi getting ur periods at age 13 is normal nothing to worry about that ok and the pimples u have got on ur forehead r likely acne vulgaris a common problem of adolescents...and periods usually occur in cyclical fashion but first few periods may not be as regular so not to worry about that also....timing between first and second or third or fourth r almost same there may be variation of 3 to 4 days .....a typical cycle is of 28 days but varies between person to person ....masturbation has nothing to do with ur periods.....there is no specific relation between weight of a person and starting of periods.....and yes u being a gymnast u may be exposed to anabolic steroids that can interfere with ur periods in a bizarre fashion......there r ways to stop or abort periods which i would not recommend for u as getting a period is an essential and natural process in reproductive physiology of a women u will learn to live happily with ur periods have some patience......and weight ....if u reduce ur weight u may get less flow during periods although it is not gaurrantied...for ur pimples consult a dermatologist for treatment and if u have more concerns regarding ur reproductive/sexual health consult a gynaecologist for some counselling ...another piont i want to emphasize is try to maintain ur body mass index below 25(calculate ur body mass index by dividing ur weight in kg by square of ur hieght in meters)