I was not talking about your mother at all, just you. Your mother gives you a little money and you want to explore/develop a hobby so take the money you are given and do that with that money. Go to the free library and learn about things that interest you and think of a way to develop an interest further. What interests you does not take approval from your mother or anyone else and if she gives you 300 yuan, work with that any maybe that will teach you how to get more from her or other sources.