I don't know what is happening. Can someone tell me?

I am a 14 year old girl and I don't know. I love to write fan fiction stories about Harry Potter and the Marauders. I also like to watch the Winx Club and write fan fiction about them too. I'm constantly changing my mind of which I like better. I have a two quizazzs and my most popular story is called The Marauders? Oh wait he's attractive. Its about Sirius's Blacks cousin who lives in America. She's 15. Her mother just got sick and is now forced to live with Sirius and his family. Her aunt is crazy and keeps trying to get her married to Regulas. Sirius then plans with James on kidnapping Cady. (Sirius's Blacks cousin) During the middle of the night James comes in through the window and together they somehow managed to get Cady to James's house. With her still asleep. Life goes on and she ends up falling in love and she gets her heart broken. Normal stuff. Now for my Winx Club and Herry Potter fan fiction story. Its about a princess (Dakota Snape) and she's heading to Alfea. Her brother Helia is going to Hogwatrs and finds his Dad and everything. I haven't gotten that far into the story but I really hope its good. But anyway what I need to know is why am I changing my mind so much? One day I'll want to spend all day typing my Marauders story. The next day I might be wanting to type the Winx Club. I'm just confused. Help?