Ummmm the main issue is that your laners probably expect your jg to win their lane for them. The jungler has a lot of pressure on them. They have to maintain object control via dragon and their creeps. There is a lot more going on in the jungle than your jg afk farming. (unless they're packing devourer)
If your jungler is playing a farm jg who is using a certain stacking item then you shouldn't EXPECT a gank before 20 minutes. I'm not saying they won't gank. Some junglers just have really weak ganks pre 6
. I see you're in bronze. People haven't really developed the map awareness for ganking at this elo. Your lanes are probably also tilting before the jungler actually gets a chance to gank or apply pressure as well. Nunu is a good example of a farm jungler. He maintains the jungle and can generally guarantee the first dragon not the best ganks if the enemy is pushed up to tower.
If your other lanes are pushing your enemy up to tower don't expect a jungler to gank for you.
There are plenty of factors.
If you need advice add me and I'll spectate your game. I mean I'm only s4 but I did climb out of bronze so that has to counter for something. haha
The best thing to do is let the lane push towards your turret enough for the enemy to be pushed up but not enough for the turret to be attacking your farm and ping for ganks.
Like I said before, if the jungler is using devourer they may prioritize stacks if it's a lane they probably won't get a kill in. The power spike provided by devourer kinda outweighs the prospect of a failed gank which is going to put them behind on stacks regardless of whether or not the kill occurs. This is assuming they have the presence of mind to see that it is possible to have a successful gank. Other lanes can gank for you as well but you need to set up a good ganking environment for them at the same time. This is just like what you should be doing for your jungler.
There are games where the jungler is just gonna have their head up their ass.
My main advice though, don't get stuck in this mindset where you blame a member of your team unless there is without a shadow of a doubt that that member caused the team to lose. I.E. flaming, feeding, afk'ing, etc.
That mindset kept me in bronze for the longest time because I wasn't playing to improve because I thought everything I did was perfectly fine. Analyze what you could have done better.
Sorry for the long post but I felt like a meaningful response was in order. <3