i know its frustrating for you silver noobs to lose your lane by yourself, but reality is: if my midlaner is shoved under his tower and ate some poke and he plays a champion who either doesnt do very good with ganks or just not very much damage in general/when behind and he is allready behind, ganking him is very often suicidal.
before you can gank him you have to make sure that:
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the two of you have enough damage and cooldowns up to KILL EVEN THROUGH THEIR SUMMONERS. ganking a lane JUST to take away their flash might be usefull in certain situations, but this is NOT one of them.
if you take away a summoner spell from a laner who is allready ahead, it does two things: first it costs you alot of jungle time and cooldowns you couldve used to actually KILL someone else and second it might cost your ally even more farm he misses while trying to kill his opponent, it might cost him summoner spells too and it costs him health, mana and cooldowns, so instead of getting back, he fell even more behind and might even have to recall now.
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the enemy jungler does not countergank you. you are the jungler, its YOUR JOB to make your ganks worth your while. if you gank and the enemy jungler shows up and you give them doublekill, its 100% the junglers fault because as a jungler, the enemy jungler is MY LANE and i have to take care of him first, get vision, force him out of his comfort zone and then gank when i know we can either easily 2on2 them or he isnt around.
to sum it up for you: ganking a lane that is behind can be worthwhile in certain situations, but the laner is not the one to decide that. its up to the jungler, and if the jungler thinks its better for the overall power of his team against the enemies team to let the midlaner farm under his turret and lose some CS (every champ can farm under his turret against every other champ without dying or at least get 50% of the minions and all the exp) while using his power and cooldowns to do something else, when that is what the team has to go with.
the jungler isnt there to feed you or help your lane, he is doing his own business in his own lane same as you, and if the toplaner doesnt roam mid and teleport bot, then its his decision and his winrate will reflect his own plays, same as your winrate reflects your 0/5 feeding in mid because you cant handle a lane without your jungler.
final words: to all you junglers out there, your ONE JOB in the game is to get gold. if you can then share your power with your laners, thats cool, and if you cant, thats cool too. just apply yourselves and remember: the enemy jungler is your enemy laner. HE is your primary business, not that crybaby fizz who loses 0/5 to a ziggs.