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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Nothwithstanding Chrono79's comment in this particular instance for a moment and talking more generally...
Dmitri1993PY --> You will find that a kata's difficulty is very approximate and even where the community feels that a kata is way too hard for a particular level often sadly it is too late to change it.
I also like you felt the way you do now. But take heart and keep going.
But be prepared for a wide range of difficulty within each level.
Good luck!
This series was created in Ruby, where you use some built-ins. Kata rank is shared amongst different languages.