You don't even have to be in the sales business. In fact, you just have to be a living, breathing human being.
Don't fight this. Just accept it as fact and move on.
Now that we've settled that, and with the selling part of you in mind, here's an excellent piece from Forbes, How to Pitch Anything in 15 Seconds, which will help you sell any product, service, idea, or even yourself with greater ease.
This piece, by Carmine Gallo, and its accompanying video will give you three very easy steps to help you build a message map that will equip you to pitch anything in just 15 seconds: