Is it visa shopping? Travelling first to Greece and then to Italy.

Hello, it’s quite urgent! I have to travel to Milan from UK for a school trip and cannot get an appointment for an Italy visa anytime soon. I have an Indian passport. So I have applied for a Greece Visa, and will be entering Greece first and then travelling to Italy. I have mentioned that the main destination is Italy in the visa application form. Can you please guide me in what to do next! Thank you!