Im too fat and i wanna lose weight ? can anyone help ?

im 13 years old. height : 164 cm. weight : 66kg. i really want to lose some weight and be able to put on some nice dresses that i cant this moment. also, this is for health concern too. im not eating lots of unhealthy food for meals but i seldom get exercise cuz im very busy with my school works. pls gimme some suggestions ! thank you so much