I Don't Know When?

I don't know when I became so unfamiliar with myself and the world I get along with. Who am I? I don't know. The surroundings are also so strange to me. Did I forget something? Why would I forget? Did I forget something? Who did I forget? Is it the forgotten happiness? Can the happiness that has been forgotten be found again? But when I am trapped by another destiny, can I still persist in pursuing the past? What will happen to me when I have both reality and past memories? Have you found the so-called happiness? Maybe what I wanted, what I was looking for, I didn't know when I had it, but I didn't know when it passed away!