Lol.... no way.. you're kidding!!! you know what?? I do the same when a room is empty.. I like that a lot.. It makes me feel like having a mic.. and yes.. Practise scales so that u can listent to the color of your voice...!! Breathing??? Singers must know how to breath before and while they're singing. If you don't take ir correctly, you're not going to produce any sound or worse, you can sing and after a few seconds you're gonna be tired!