is it natural to go oom in like 5 seconds flat in pvp?

i mean like i know im only 20 but i figured id get a feel for pvp and i was like 1v1 this full int mage who was the same level as me (probly a twink x.x) and i wouldnt stand a chance. i can time my heals right and put down my combos right, but i just couldnt kill him before my mana pool was up.

idk i just wanna know if im doing something wrong ><