It’s a skill that you’re building. Just like everything else, it takes time. The worst part of learning anything as an adult is you are actually aware of how bad you are at something compared to the greats and are acutely aware of the time. My recommendation, passed on from the fella who taught me, is to stand in front of your bed or similar. It stops you from walking around, catches the balls for you if you drop them, and you can collapse into it in frustration if needed.

I tell people that I can teach anyone to juggle in 20 minutes. It’s fun to get it going when you’re otherwise just standing around, and practicing the fancier patterns is good for keeping yourself occupied.

https://libraryofjuggling.com/ There’s some really neat info there.

google it. Look at the first picture with subtitles. Then watch the movie.