Honestly? I enjoy fanfiction. I don't see why you would need to write something other than that, but I understand wanting to branch out as a writer. Your spelling and grammar in this post is not horrendous, so I assume you actually -do- have some writing experience and skill, just not story-writing.
However, if I was in your position (and I was,) wanting to switch from fanfiction to my own ideas (and I did) I might examine what it is I like about writing fan-fiction. Once I knew what it was about the original works that inspired me, I might base my story on one of the worlds, the concepts, or the characters, but avoid copying directly. Or, hey, I might draw from a dozen sources. Truth is, you are always drawing from some source around you.
Example: Let's say I was a fan of Sailor moon. (I'm not, because my opinion is that the protagonist is an air-head and the love interest is kind of pathetic, but eh... magical girl is a common genre.) Okay, so I might want to establish a group of protagonists with secret identities who use quirky magic powers and change their outfits while shouting catch phrases. xD
Adding another show, let's say... Full Metal Alchemist. Maybe one of the main characters was in a terrible accident and has robotic limbs... or maybe one of the magical powers is to shift the shape and condition of items around them, creating weapons.
Let's throw in Yuugiou for... reasons. Maybe two of the characters are identical twins and summon monsters / dead warriors from another realm as their power. Or maybe one is secretly a king / queen / monarch and has multiple personality disorder.
I'm willing to accept a co-author, but I'm not sure about which story.