What exactly am I supposed to do?

Okay so I've been playing Janna support a lot more lately, I don't think I main her but that's probably the person who I'm closest to maining. And of course support is second most flamed just after jungle. And of course, me being pretty terrible at this game, I get flamed A LOT by my entire team. If I'm doing good or bad. Doesn't even really matter on how I'm doing. So... if I get flamed almost each and every single game that I play. How am I expected not to have a negative attitude. Since obviously I do become very negative during such games and get reported for it. Just would like some advice on this. (And yes, I do mute them.)
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