I would consider my best role to be Jungle. and as a jungler there are many things that i consider before i even think about ganking a lane. things like:
how much CC is there on my team? Am i Master Yi trying to gank a Siver/Soraka bot lane? if so, there is no hard CC in that situation and the gank will probably at best burn a flash.
how much CC is there on the enemy laner? am i ganking a Level 6 Malzahar or fiddle or Leona/Varus? if so has their CC been blown? How fed/behind are my teammates/Opponents?
how high of a priority is the gank, am i stopping a Nasus early so as to deny the late game tower smasher? Am i looking to help bring down a tower?
Where was the Opponent Jungler last seen?
as a jungler i'm trying to use all this information to prioritise ganking, farming, counter jungling, and buying items. if your bot for instance, and your lane is in trouble, and you ask for a gank, i might come bot, if i'm close and the other lanes are pushed. but what if i could help take both the mid and to T1 towers? i'm going to do that, and i would hope that in the mean time you would play safe, maybe let your T1 go but not hand the enemy a double kill as well. you will get help, but it might not happen on your timescale. i've had games where i've fed 3 kills top lane, but asked the jungler to gank OTHER lanes, and we end up denying 4 opponents objectives while letting on have a tower or two.
the most important thing to remember is that you're part of a team, and you will succeed or fail as a team. you must trust you team to do whats best, and if they don't then move on. but never yell at them, never curse at them, for that only makes a bad situation worse. some games are not winnable, and i mean that. you will not win every game, and you should not expect to. you and teammates will make mistakes, but instead of focusing on them, try to minimise the mistakes that are made and move on, either to try to win the game or to play another.
also, never, NEVER, EVER type "sigh". its the most lazy, passive aggressive statement you can make, and it is never going to help a situation, and it makes you look like a spoiled child.