Last year during thanksgiving, i had gotten my braces off after having them ever since i first started playing trumpet in the sixth grade. Now a sophomore in high school and almost a junior, months have passed and i feel as though i haven't made much huge improvements. Almost all notes tend to frack and crack, notes above B natural in the staff tend to get a double buzz, i am unable to start notes exactly on beat one as it feels like my lips are too tight or lots of backpressure, which i have been trying to get better at but not much improvements, when slurring up scales, starting at C in the staff it starts to get very resisting and very forced, completely having so much problems being able to even hold out any note above B in the staff without having double buzzes in the sound. Recently my director had noticed that when i put my mouthpiece on my lips, the left side tends to go up while the right side goes down, kind of like a diagonal embouchure, and might be the problem on why the starts on my notes are horrible. i haven't been able to get help from my private lesson teacher since my director had told me about my embouchure the day after my lessons were, so i have to wait next week. When i first got my braces off i continued to play on the same mouthpiece which was a B&S 5c, worked for a few weeks but felt a bit too sharp on the rim then went back to a bach 7c, after a few weeks the mouthpiece started to feel a bit too small and tight so i went back to the 5c, then even that felt too small and tight, so i went to a bach 3c, first week it felt comfortable and i was confident in it, but now i'm getting somewhat the same too small and tight feeling. Now i don't even know. I'm in the school's windensemble band and i play 1st part in 2 of our 3 music, and so far i feel as though i won't be able to get any of it ready for our recording. There have been at times where i was able to play parts perfectly and i felt confident, but when i try to replicate the same thing the next day, and the next, crap. Some parts are good but not to what i hear in my mind. I don't know what it is that is keeping me from improve my playing.