You certainly chose an interesting topic for your essay. It is possible to discuss anything you want since the prompt calls for you to:
describe the world you come from - for example, your family, community or school - and tell us how your world has shaped your dreams and aspirations.
Performing French drama can definitely fall under this category if you were enrolled in a drama class and French language classes. That way you can use 2 of your personal experiences to explain how the performance helped to shape your dreams and aspirations. But first, ask yourself this, are you applying to acting school? If you are, then go ahead and use that as the subject of the essay. If not, perhaps it would be better if you can use another part of your world that has some sort of connection to the course you are applying for admission to. Another question to consider is; are you clear about what your dreams and aspirations are for the future? What personal experience or personal event happened to you in the past that helped you reach that point? Once you answer those guide questions, you will be able to develop the topic and content of your essay in an almost effortless manner :-)