The name of the game here is absorption...not of water, but of sound. Stay away from hard-surfaced areas like bathrooms, desktops, and bare walls. Soft, heavy materials absorb sound, and help cut down on the reflections that make your room sound echoey. If you have a lot of clothes hanging in the closet, try standing in the doorway of the closet facing inward. Gather up whatever pillows, blankets, towels, and other materials you can find, and make a nest for yourself in the middle of the bed, away from the walls. Or try flipping the mattress up into a vertical position and standing near it. If your room has two beds, flip both mattresses up and stand them at an angle relative to one another.
Also remember that the closer you can mike yourself without getting plosive P's or
other problems, the stronger the direct sound from your voice will be relative to the
reflected sound bouncing around the room. Keep your mike off about halfway to the side of
your mouth, but mike closely.