I don't know what my problem is. Brain fog?

What is it called when your brain won't shut up about everything all at once (all things good AND bad) enough for you to focus on actually doing anything?

I'm an artist and crafter as well as aspiring to things like studying specific subjects and I deeply wish to get into gardening, but it's hard to focus in the free time I get to do these things. It's like my brain won't stop thinking about everything long enough for me to actually focus on making myself do things. It won't stop thinking long enough to actually DO. And it's everything, both good and bad, cycling through my brain.

At times music can help me to focus, but it doesn't always work so well...

Thanks in advance.