How can i learn not to being my emotions onto the tennis court?

So im always super pissed and depressed, except for a few rare occasions. Anyways, whenever i play im already pissed as it is and i just wanna break my racquet in half (i throw it but not break it) every single damn time i miss a damn ball. And its just so damn frustrating cus what im pissed and depressed about relates to tennis
 
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