In your very first post (Kaffarah for breaking an oath confusion) you asked whether a 13 years old person must expiate for breaking oaths.
In Islam the age of maturity is not fixed by an age, unless no sign of maturity appears on the individual else once one is mature and legally responsible (mature and well minded) one must follow the rules and therefore is asked for expiation I've addressed this in my answer on your question Must the fasts for Kaffarah of breaking an oath be consecutive?.
So until now we don't know whether you are legally responsible or not. So this question still needs clarification.
Assuming you are mature and legally responsible we may move to the next issue which is do you have the means for a payment of an expiation. In the comments you say you have no possession over wealth (money). This means the only expiation you are allowed to perform is fasting in case that you broke an oath.
There might be the possibility that you ask your parents to give you some of the money that was saved for you to pay an expiation, but honestly I wonder if they follow your instructions and I wonder if the payment of your parents for your misdeeds ins this case count.