Your product is probably very easy to use. You are the best proof: Everything works as designed, each button is where it is supposed to be.
Now please keep in mind that you, as the product manager, know the product like no one else. In order to find out if your product is really as usable as you think, you need to speak to the users or potential users. This post illustrates five ways of receiving great user feedback that will help you improve your software product.