As we know, love is so powerful in Uchiha bloodline and that makes them stronger and stronger. Because Itachi loved Sasuke more than anything, he was able to sacrifice himself for having his beloved brother to get strong enough.
Now, it is absolutely so hard for Sasuke to maintain his calmness about his family, however, he is able to give up on himself for the goodness of his family. He knows that sharingan needs a heart breaking moment to get awakened and he knew that the first meeting will make Sarada awaken her sharingan and this makes her development faster. Also he is well aware of the possible dangers which may cause serious problems around the village. So, indeed Sasuke bears the burden more than Sakura and Sarada did, yet he doesn't want others to know what he has in mind except a few,maybe only Naruto, just like his brother Itachi.
Now, it is absolutely so hard for Sasuke to maintain his calmness about his family, however, he is able to give up on himself for the goodness of his family. He knows that sharingan needs a heart breaking moment to get awakened and he knew that the first meeting will make Sarada awaken her sharingan and this makes her development faster. Also he is well aware of the possible dangers which may cause serious problems around the village. So, indeed Sasuke bears the burden more than Sakura and Sarada did, yet he doesn't want others to know what he has in mind except a few,maybe only Naruto, just like his brother Itachi.