Hmmm, when I read your post and the first responses, I figured everyone was right . . . that you were shoving the thing in your mouth too far. I even thought I had the solution for you . . . putting a rubberband around the beak so that you would become aware of this and thus able to stop shoving it in.
Pleased that I had solved your problem, I picked up a whistle, and . . . did exactly what you show in your picture.
It’s not that the whistle is in too far, but that the lip just seems to naturally curve under the teeth.
I think I am doing it in an attempt to keep the moist part of my lip off the whistle. By “rolling” the lip, the dry part comes in contact. I don’t think I can stop this, either. Or want to, because having wet lips all over the whistle seems somehow disgusting. Bleah.
There just isn’t enough lip here to do it any other way.
I can pucker up and pooch out my lips, but it’s bizarre. Do you people actually hold your whistles this way?
After several tunes, though, I realized that I was beginning to try to GRIP the whistle harder. Are you doing this? Trying to grip the whistle with your mouth? To hang onto it, as it were.
Perhaps being aware of that will help you. But I can’t think of a trick to make you stop, except perhaps wearing a bite guard while you play.
Sigh. This is probably why all those music teachers told me I didn’t have the right kind of lips.
I’ll just have to switch to pipes.
Or bodhran. Everyone knows they’re much easier to play. So few people play them, too, that you’re always welcome.
But you’ve probably got a lot invested in your whistle, eh? Don’t want to abandon it so soon. And you shouldn’t, not really.
I notice you say your face is hurting. If you’re just biting your lip, then your face won’t hurt because of it. So, that tells me that you are tensing up something else in your face, and causing muscular strain, and that is hurting.
My guess on this is that you are clamping your mouth shut and tensing up the muscles that you chew with.
Where’s the pain, exactly? Is it around your lips in a circle? Or, is it mostly from the corner of your eyes to the bottom of your lower jaw?