Hello everyone

I've tried making an Icosahedron using the 3D sketch tool, and now I'd like to make it into a solid body. But how?
I tried looking at some of the tips from this thread; ​ , but I can't get any of it to work.
The reason I might be having trouble, is because I made the sketch in a kind of wonky way since I haven't used the 3D sketch tool a whole lot.

This is just a "fun" little thing I'm trying to get to work, but I'd be happy if you guys could help me out.