I need your help please?

Okay so I've tried everything to lose weight & i won't lose any at all! I've tried workin out cutting off al sugars tried eating healthy even takin pills & nothing will work! My problem is that i never poop! Yup never maybe once a week or so but thats it n I've heard this can be my problem also my aunt has cancer due to the same problem & i dont want to go through that so anyone know of something i can drink to make me poop im startin to drink green tea cause i heard it works but I don't know has anyone tried it please help me out guys i dont want to get sick im only 18 years old!
I need your help please?
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