Aliice,

You should be able to get the goddess skill, provided that you can get a group of strong players to help you out (60+, with a high MDEF water support to revive). I am on the Cancer server in the guild ShadowsOfHell, and our record low was a level 30 character (haven't tried any lower - but it should be possible). Just make sure to complete all the quests necessary (and DON'T forget to unequip your human pets before going into the waterfall by Holy Village!)