When you bought the saw, did the store give you training on the proper technique to start and use it? If they didn't, take it back and ask to be trained on working the saw. Remind them that this is part of their contract with Stihl.
This is one of the reasons that you can't buy a Stihl from a big box store. Every Stihl power tool sold is supposed to include a personal, one on one training, so the new owner is comfortable with how to start and use his/her new tool.
I had the same problem with my MS180 C when it was new. The starting mechanism is different from my other Stihl tools, which both have primer bulbs. The training I got wasn't the best, as the True Value store I bought it from was brand new at selling Stihl, and the guy who trained me had just got back from being trained himself. Since then, I read the manual and have the start method down pat. Never had a problem since, starting from hot or cold.
There is probably nothing wrong with your saw. Read the manual. Get the store to teach you. Practice a few times. And then, you probably will never have another issue.