Help your jungler with the crab
(excuse bad english, I'm not from NA just want to share this thought/advice with you)
Typical situation: min 2:00, both junglers find themselves in the river and start to fight for the crab (EXP for level 3 + vision). And it always end with the crab in the side of the first mate who moved to the fight, which can get an easy first blood depending of the team comp.
Are you the one of these player that never help their jungler? Why? I promise you, when I go mid/top I drop minions to help in the river or invades and the result is ALMOST ALWAYS sucessfull, but when I go jungle my team just don't care about me while I get invaded (and I always ask for help). For every teammate that moves during early game to help there are also another nine players that until level 6-10 don't move out of their lanes.
Please, try to push in early if you can and help your jungler. A first blood may result into winning early game.
Regards.