Is it normal i poop once every 10 days

All of the females in my family have the same routines, poop once every week and a halff. Ive tried fiber pills and natural laxitives but they just make me fart, not poop.. Ive asked my doctor and she says to drink more water and eat more fiber but like i said the fiber does nothing and i drink about five full water bottles a day. I am also a very active 18 year old. I work out three times a week so its not like im not active.. any ideasss