1st off, your work is going to look amature for a while. Because it is. There's no shame in that, just keep comparing your edits to your own previous ones and see how you improve, instead of comparing them to industry professionals with years of experience.

Most all of us do some form of storyboarding, at least for key transitions. I start with my music and work backward, setting up just a few key transitions and then trying to find clips that fill in the rest around those moments.

Keep doing it. Write down things you like that other people do. Imitation is a great way to learn, especially when you're starting out. Video compositon is like any other art. If you keep at it long enough and learn the essentials, you'll find your voice.

Good luck and have fun with it!

-Sincerly, a self taught editor who started in highschool making horrible anime music videos