Well of coarse your killing slower, your spec is ment for healing and survival.
It is not so bad though Flame Shock, Earth Shock, Lightning Bolt, Searing Totem, and even Flame Tongue Weapon can put out some decent damage as a restoration spec shaman in Healing gear. What I see most Restoration Shaman do is they seem to like to cast one Lightning Bolt and then follow that with a Flame Shock, for totems since it may take longer to kill try to place them in a good spot to pull enemies towards you and drop totems like stone skin, mana spring, wrath of air, and searing totem. Keep Earthen Shield on generaly but when needed try to build up your mana with water shield also.
Your lucky, not to long ago healing gear did not offer any spell damage so it is not so bad now, about one third of your healing will also provide spell damage which is way more then the old 0 increase to damage. Being restoration spec means when your not in a group you need to be patient, enemies are going to die slower but killing you should be pretty tough. Also, if you truely don't want to be restoration then go back to enhancement no sense not enjoying your own toon, you made him, you leveled him, you play him, if you don't want to be a healer then play a dpser and if your guild doesn't like it then whatever no point being in a guild helping them if your not having fun.