How to shut up inside

My problem is thinking too much when I don't want. I don't neccessarily want to consciously think when I eat, when I ride my bike or when I wait for the next lesson in breaks. I sometimes just want to shut up outside and inside.

English has become my favourite thinking-blocker, because it collides with German.
Let your brain struggle with two languages you use like they both were your mothertongue.

It's mindfuck.

The strategy doesn't work if you don't want it to work, of course. Poorly, there are always some topics you can't stop thinking about because they are your sense of life. Don't shut them out. It's not worth it.