Have any other atomizers to try? It could be for a number of reasons, the atty may not be primed properly, it could the strength of draw your taking is too much or too little, the atty could be dry or flooded.
If you do some reading, you can learn about what best ways are to clean out an atty when they have a burnt taste. Ive found that boiling and soaking it in coke worked quite well for me when i had a 510 atty that tasted terrible from the start.
Be sure that if you do choose to clean the atomizer, to take your time performing every step, do the washing/boiling, then blow it dry, give it a few minutes then to the 1sec burn dry, then take it off the battery and give it 2 or so drips and let it stand for five minutes, then give it another drip and take a couple of soft draws with a fresh (but not over filled) cart.
how old is the atty? is it new? did you flush out the initial primer when it was new and re-primed it with your own
ejuice?