我可以亂入一下嗎??

I don't know what am I doing here....
這句英文是版大寫的還是從其他文章看來的,文法好像錯了...

我不是來搗蛋的,我只是好奇這句英文的文法...
I don't know what I am doing here....
應該是上面這樣,有錯請糾正..