OP, you are young, your parents are right. They worry this habit will become addictive and you will spend the rest of your life as a "pot head", and it does often lead to stronger things which can ruin your life.
It makes it easier to "hang" with a criminal element which makes you and your family more likely to be the victims of crime.
I know men in their 50's that started smoking pot as teens and could never give it up, it ruined their lives.
Sure sugar is bad, as is wheat and trans fats. But that is a whole different subject.
Spend your time looking for natural cures to what ails you and you will find much information.
Niacin, better diet, more vitamins, less chemicals, more exercise and a good nights rest. If you are not feeling right it is not from a lack of pot.
I do feel that as an adult pot can be useful just as drinking in moderation.
I'm 100% for legalization which removes the criminal element.
Your parents love you--you won't understand until you have children of your own.