OK, well think about something you enjoy doing or talking about or even fantasizing. For example, a mystery story, a superhero story, a love story. You can use real world problems as a topic or base something of of it.
Ex 1: a story about finding a long lost family
Ex 2: someone going an a quest to save kidnapped women and children
Ex 3: a story about a little girl who lives in an orphanage and discovers a dark secret about the head Teacher or mistress
Use you imagination !!! Hope this helps!!!