My Apple ID is greyed out and i can’t access it.

If an app or feature on your device is not working, it may have been disabled using Screen Time, or by an IT administrator if you are using a device owned by an employer or educational institution. See how to 'Use Screen Time on an iPhone, iPad, or iPod touch' by clicking here --> https://support.apple.com/HT208982

My apple ID is greyed out on the iTunes store. I am trying to purchase music to download to my computer. My computer is up to date.

Did you read what Limnos posted? Have you checked Settings/Screen Time for any restrictions? Is your computer owned or controlled by someone else?