Jungling is an extremely big role for getting your team early control.
You just need to have the correct mindset, and honestly low elo players just don't understand that plays can be made. They just don't do it.
"Just do it" - A wise man once said.
Start getting lvl 3 after completing some jungle camps (try picking an early game jungler if you want, someone like Lee Sin, or Shaco).
Then just go mid... and camp like you've never done before. The same can be done for top if needed.
Although you do need to find the balance between camping SO hard and actually going back to do camps, because if you just camp a lane and don't do camps you'll eventually find yourself pretty far behind the enemy jungler experience-wise. You do need to be an experienced jungler in order to pull of things such as camping hardcore.
After scoring a kill, push the lane. Screw anyone who tells you otherwise to NOT push the lane...
Then tell the laner to push to turret and start beating it down. After you got a good few hits on the turret it'll be around half health with your laner's help.
Recall, get COMBAT-TYPE items (swords, AD, AP, etc), and go Re-Gank the lane that you finished pushing.
Chances are their flash is down already because you've ganked them previously before, meaning even a HIGHER chance to kill them again.
Continue to kill, push, and beat down the turret until the turret is actually beaten.
After that, head to the other lane that you haven't ganked/taken the turret, and repeat the same exact process.
Except if you ever plan to go bot, after scoring a kill tell your bot lane to head towards drag and do it.
This will give your team an IMMENSE gold advantage AND an increase in map control
Start buying wards to ward the enemy jungle and try to catch people out (if you can burst them down easy, like lee sin).