"It's my turn" is the most common way to say this in English. This phrase comes from the idea of taking turns doing something, such as playing a game or speaking in a group. Here are some examples:

"It's my turn to play the game."

"It's my turn to speak in the meeting."

In Chinese, you could say:

"轮到我了。" (Lún dào wǒ le.)

"现在是我的回合。" (Xiàn zài shì wǒ de huí hé.)