How to learn a mechanically difficult champ without going insane

Ok so me, im a very intense person. I also set extremely high expectations for myself. Thats just who i am. So when i invest myself into something, im all in. When i first started i was terrible but i expected that and i didn't have a problem. But now a year later i have a problem. I pick a champ like shaco to learn. And i lose, no big deal, i lose again, again, again...i lterally get to the point where i hurt myself because i am so angry. Should i make a smurf to practice on? Would that alleviate the pressure? Cause i honestly dont know if i can commit to this. Not just with shaco but any champ. I know this sounds silly but nevertheless, that's my problem. Any help would be appreciated.