welcome dt HCM.diet also causes constipation
, your age is small to have this problem. please take plenty of water anout 4 to 5liters. avoid junk amf non veg food. tahle pelnty of raddish ,cucumber, and take full grains wheat ((roti)and other fibre contain fruits and vegatables. if possible green plak(500gms. daily) it will few days if tou stricall follow it.