Up & Coming Songwriter? Doubt It...

So in the back of my brain I want to write music. I just feel like I need to find that "muse" so that it can just flow. I can sing it outloud but writing it down is where the issue comes. So maybe I need to record myself randomly making up songs so I can write them down. I have the tendency to go off topic/theme. I need to learn how to stay on the same gameplan. I need to learn how to do a lot. But idk. -shrug