My younger female cousin is three years younger than me.

堂妹比我小三岁。

My younger female cousin just started college this year.

我的堂妹今年刚上大学。

I often go to the park with my younger female cousin.

我常常和堂妹一起去公园玩。

My younger female cousin loves to draw, and her artwork is beautiful.

堂妹喜欢画画，她的作品很漂亮。

Every Chinese New Year, I set off firecrackers with my younger female cousin.

每年春节，我都会和堂妹一起放鞭炮。