I DPS as much as I can as a healer, and I just did a dungeon as DPS with a scholar who did 0 damage. All he did was cast a physick every now and then - his fairy did almost everything. You have the tools, please use them. I don't expect healers to do amazing DPS (no one does) but every bit helps and it doesn't make it look like you're just standing there. Cast dots when you can, learn to enter cleric stance and use 2 damage spells and then turn off cleric stance. You don't have to DPS all the time - just do it when you can, and you'll feel great knowing you're contributing.