Trouble at DPSing in WoW...Please help.?

I have an 85 ret pally and an 85 shadow priest. I've heard that I should doing 10,000 plus dps but I can't get over 5-6k on ret pally (in mostly blues) and I can't get over 4-6.5k on my shadow priest ( half blues half greens). Pally is item level 327 and shadow priest is item level 321. The dps I mentioned was on the raider's dummy. In battlegrounds I am doing below 2k dps for some reason. I have tried reading up on rotations and I've tried different rotations. Nothing is helping. I've seen people LFG for pug raids and they say things like "No baddies with less than 10k dps please." Am I bad if I can't do that much damage yet?