Classic Lvling fire mage and struggling a lot?

Even questing and weak mobs it takes me so long to kill them, I have got combustion and all that and it still feels like I'm doing no damage? im lvl 30...other classes like ret pala/unholy dk/ele shaman were a breeze but with mage it feels the opposite :/ via /r/wow https://ift.tt/2KPZnu4