Bad Vibrations
A second source of noise is your voice's reflection off of hard surfaces like walls, hard floors, and the surface of your desk. You can experiment with carpet, curtains over reflective glass windows, and hanging spare blankets on walls or in a corner where there is a troublesome echo. The professional way to acoustically treat your room is with acoustic foam, although this is not necessary for beginners; some smart rearrangement of the furniture and a strategically placed mattress is all you need to get started.

In the future, if you decide to upgrade to a professional microphone, think about getting some better acoustic treatment at the same time. These two purchases should go hand it hand; after all, a great microphone will still sound bad in a terrible room; you'll just be able to hear all of the room echoes much more clearly!