Can I write by English?

I born in Korea and use Korean to talk and write in whole life. Then can I write by English? It’s not easy but it’s not impossible. So I’m thinking of doing it.
Then what do I write about? I am going to write about me and Korea. Because it is best thing that I know. How often? I will write more then once a day as possible.
Why I do this? I just do it. It does’t have any reason.