Caitlyn is not a bad jungler.
Start at golems and use your Q at jungling.
Remember to stay in the bushes, as your passive is then more usefull.
You can place traps at strategic places beose you�´ve got enough mana as you have to recall alot.
If you play it well you wont be underleveled.
Dont forget to use the health potions.
Also use the summoner spells smite and heal.