I have been playing wrong for a very long time now, since i began to be honest.. The mouthpiece is not directly on the middle of my mouth. When I play, its a little on the right side of my mouth. Each time I try and put the mouthpiece on the middle, it slips back to the right side again. And each time I try to put it on the middle, I get ugly sounds from the cornet. I have no problems playing like I do right now ( with the wrong embouchure) but Im thinking.. "If I would play right, would I be alot better than what I am right now?" Is that true? Right now Im kind of desperate, and how should I practise to get the mouthpiece on the middle of my mouth, so I wouldn't bother with it anymore?