I have an ugly story about this. When I started playing i had a really high-center embouchure with a MASSIVE aperture and almost no bottom lip in the cup. I was diligent and enthusiastic and disciplined and so I was able to be a good HS player, but after having my teacher at Interlochen switch my embouchure, I realized that i was doing 10X the amount of practice for the same payoff as I could now on a more balanced embouchure. You have to have an acceptable set-up, and the sooner you get one, the sooner you can just shed-till-yer-dead. Are both lips inside the mouthpiece, and is there a portion of part above each lip on the rim? DOUBLE CHECK WITH TEACHERS THAT KNOW! Bobby Shew is VERY good, he does webcam lessons, you can send him photos. Also, my teacher in Michigan is a master of fundamentals (Ken Larson). Get a lesson with someone who went through what you are going through, many teachers will tell you to just play through it when you would be better off switching it now! Maybe we could have a maser thread on embochure/position pics, lol? Good Luck!