“走进自己的世界”可以用英文表达为 "enter one's own world"。这个短语指的是某人进入自己专属的、独立的世界,可能是心灵、想法或生活方式等方面。

下面是一些例句:

She always loses herself in her own world when she's reading a book. (她看书的时候总是进入自己的世界。)
He spends hours in his own world, tinkering with gadgets and machines. (他花数小时在自己的世界里,修修补补各种小机器。)
She creates her own world through her art, where she can escape from reapty. (她通过艺术创造出自己的世界,在那里她可以逃离现实。)

这个短语可能来源于人们常常把自己的心灵或思想比喻为一个世界,即某人的内心世界或想法世界。这种比喻方式在英语中很常见,例如:

He's a creative person with a rich inner world. (他是一个富有创造力的人,有丰富的内心世界。)
She's always lost in her own thoughts, pving in her own world. (她总是沉浸在自己的思绪中,生活在自己的世界里。)