Set a story in a boarding school with a posh uniform were everyone is expected to be perfect. Have someone be really perfect for teachers but is actually a bully. And make sure you always know where you are headed even if you don't know how your going to get there. For example if you start out wanting to make the main character commit suicide just make sure that character has a reason for it. Then if later on you get a better idea don't be scared to change that to were your aiming to go.
Have it be about a futuristic world where humanity shares a hive mind, and a select few individuals are separated from it. These individuals need to save the world from the collective human intelligence that's basically a massive mindless, dead-set human self-invasion. (Like zombies, kinda)
U shud make it about a person that is not loved by anyone and like hated by everyone. They pretend to be his/her friend but they back stabb him/her. Then this one girl/guy comes and you elaborate.