Why is it so bad to lose ?

I've been playing for a while and I'm feeling that it has never been so frustrating to play, and to lose. I don't play a lot these days, I'm not in a LoL burnout, yet I had two loss, two awful games, the kind of games that make you want to uninstall. I'm a grown up, I had my share of unpleasing experiences, yet I still rate this kind of games very high among the kind of stuff that gets you out of your mind. I don't know why this game is like that. I don't know if it's just me.
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