When I was younger I used to be like that. The sidequest in Majora's Mask where you have to drive away the aliens from Romani Ranch, took me for freaking ever to finish. I remember I would always get really really close then lose, and then I would throw a fit. (I was in like fifth grade to be fair) it took me almost a year to beat that stupid side quest, and when I finally did I think I cried.
A lot of bosses in Final Fantasy games have gotten me to that point too. I don't have enough patience to level up like I should, so a lot of times I'll get to a boss that's almost impossible. Like really almost impossible. Seymour Flux, Yunalesca, and the final Fujin and Raijin battle come to mind. I think I screamed "YES!" when I finally beat Yunalesca. Oh, also the final fight with Xeanort in Kingdom Hearts II took me like a month to beat, but after some serious button smashing, I finally defeated him, with me having just a fraction of health left.
I don't play video games like I used to, but Bad Girl from No More Heroes took me a couple of days to beat, other than that I haven't had much problems recently.