tab9 summed it up pretty succinctly. You're at the awkward teenage years of White Magery. Things will get better, soon. Particularly once you hit 38 and get Shroud of Saints. In the meantime, make sure to keep some Ethers / Hi-Ethers on your hotkeys for emergencies, and get used to spending less time DDing due to MP restrictions.

http://www.ffxivinfo.com/class/conju...roud-of-saints