It would be helpful to know where you live in order to give you a better answer to your question. It would also be helpful to know why you are living with a guardian.
For instance, if you live in the United States, here is one example of a law in New York State. The bold letters were added by me.
New York State
"Where there are children of the marriage residing in New York State and under the age of 18, a demand for custody is mandatory in divorce actions.
After the age of 13 the child is allowed to choose which parent to stay with. Whether the parents are divorced or just separated one parent cannot demand the child stays between the parents. Where the children reside outside New York State custody may not be determined, except in some instances by stipulation. Custody may not be awarded to a person other than the father or mother, except under unusual circumstances which require a hearing. Children under the age of 21 must be supported by both parents to the extent that they are able to support the children under the provisions of the Child Support Standards Act.
See paternity for discussion of judicial recognition of filiation which may be necessary before custody or support may be determined."
You also might like to check out the information on the following site:
Child custody laws in the United States - Wikipedia, the free encyclopedia