As others have suggested, give red mage a try. But for the love of cupcakes do not play SCH or WHM. While they can be macro'd just like any other class./job, healers and dps should never ever macro their stuff. Also you're not doing just 8 man content, were the other healer could help out, in 4 man dungeons you might run into severe problems, if your reaction is that slow and you on top of that, would have your heals/shields on macro. Now it's different with using macro's for fairy management but maybe you give it a try, after you're a bit more used to the game itself. Because not just tanks should know the dungeons, healers do as well, as well as knowing every mechanic in there, so they can pre cast heals/shields/aoe heals etc. Not knowing that, can be very overwhelming and frustrating.