if they counter jungle you you have a couple of actions.
1. ward the hell out of the map - i realize this is easier said than done, you're behind in level, gold, etc. and you don't want to be held back by buying things unnecessary for your build. But:
A. it needs to be a team wide effort
B. It provides control of objectives, which can give you an advantage
C. and, my most favorite, it allows you to capitalize on them trying to counter jungle you. If you're warded at your entrances and you see the enemy jungler coming in to either steal a buff or kill you, start pinging him like crazy and have the 2 closest lanes come, swoop in on him, en tandem with you and just destroy him. Most people won't counter you again after that, unless they start ward killing, maybe. But if they're stupid enough to do it again and you're smart enough to keep warding, just keep punishing them for it.
2. jungle a bit, but start focusing more on ganks (works a lot better if you have the mastery points in the extra exp on kills and assists). Just gank like crazy, as a roamer, or camp the hell out of one lane and help your laner snowball. When you get an assist, you get 75% of the gold you would have had you gotten the kill (assuming its just you and one teammate). That'll help a lot! Also, you can hold lanes/chill in lanes to gain a little safe exp butttttttt its not overly recommended.
sorry for the wall of text, hope it helps