How can I stop thinking and shut my brain off?

You can't, :), But you could manage it, Try For about 10 to 15 minutes a day, “Write down what’s on your mind at an earlier time and what you’re doing about it,” distract yourself from your worries with so mental exercises, Focus on the positive, Try walking to clear your mind "beach, forest",

One thing to keep in mind is that trying to not think about something is the worst possible way to avoid it. The best thing to do is to tell yourself that you are aware of all the thoughts you could be having at this particular moment, but that you can think about them later.

Stopping thoughts altogether is easier said than done. Instead, try to disengage from the thinking, and objectively observe the thoughts, like cars on a highway. Just sit back and let them whizz around the highways of your subconscious. Sometimes it will be a clown car, and other times a garbage truck. The important thing is to not get too carried away with any one car. So keep thinking, but don’t get too carried away :)

Some people may find this very hard to do, while others may find it very easy. However to do this i would recommend simply trying to do a mindless task such as doodling whilst listening to some relaxing music or music which you find enjoyable. Meditation is also a good way to relax and not to think about things. But in my opinion the ultimate way to achieve this would be through practicing mindfulness.

Meditation is a good way to stop the mind from racing. Meditation takes practice, however, so it does not work immediately. There are many resources online, and mobile apps as well, that help you learn how to meditate and encourage practice. Meditation helps clear your mind of intrusive thoughts, and is scientifically proven to help with stress and anxiety!

Personally I use meditation or yoga to do this. Just put on some relaxing instrumental music, sit comfortably and concentrate on your breathing. It might help clear the clutter of thoughts in your brain.

Try relaxing, breathing techniques can be helpful or you can search up relaxing music on you tube. If this doesn't work try writing down or talking about how you feel.

You can try meditating or yoga which can teach you how to relax your body and mind. Trying some of these may allow you to learn how to control your thoughts and how to prevent you from dwelling on things you would rather not think about

Meditation sounds like something you should look into. You can meditate to help ease overwhelming burdens. If you need advice on how to start you can always message me.

Try meditating! Focus on your breathing. Take a walk through nature, or focus on a specific object for a while.