Story opening by Lucas- His own story

Suddenly I woke up. I was lying on the grass, and my head was hurting. I looked around me, but I just saw trees. Nobody was there. I stood up and started walking, but that place was very big. The only thing I could see were some buildings very far away. The trees were about 20 metres tall, but they didn’t have a lot of leaves: I could see the sky through them. It wasn’t a sunny day. There were clouds covering all the sky. Two minutes after, it started raining, and I ran to the city.