Controlling thoughts is like running after Butterflies and trying to catch them. The mind continously "plays" thoughts and throws images at you - that is what it does best. Like your stomach juices flowing around. The only success I ever had to find something close to a "calm mind" is to allow the thoughts, to accept them and just stop caring what they are, mean or where they come from. Then I try to observe my mind and guess what the next thought will be or just trying to observe the "confusion" and suddenly it becomes still and quiet. It's like if the mind doesn't like to be observed and stops, waiting for "you" to look away again and start its job again. Strange and interesting experiment.
Something like looking at the sky and seeing clouds, birds passing by without being able to control them. Just let it be.
But I get your point OP. We cannot influence our surroundings (or at least that is what my conclusion is...so far).