dont look at the progress they are undoing. look at the progress you made, the fact that you were able to overcome what you did probably demanded so much strength of character and so much willpower to pull youself out of a rut that not everyone can do. i cant imagine how hard you worked to get to where ou are today. you were bullied as a kid, but you survived. and that was without the maturity that naturally comes from age and life experience. just from those two instances, its obvious that you are so strong and are able to move forward. look at that aspect of things. you cant lose progress if no progress was made. to fall from point A, you had to have made it to point A. try to tap into that, whatever got you through other stuffcan get you through today.
also, letting you know, im not a professional in any way, so maybe it would be worth it to find someone to talk to, a parent, guardian, teacher, menotr, therapist, whoever. someone ur comfortable with, and who makes you feel good. surround yourself with people who get you.
one last thing that ive personally found helpful in boosting confidence in certain areas is this: whenever someone gives you a compliment, listen to it. any compliment. listen to it, internalise it, and think on it. work on accepting it. dont just discard it, you arent being concieted by recognising your strengths. words hurt so much because they have a power, but that can be used both ways. any complimentary words that are said to you, take them, think on them and accept them, let them build up what other words are breaking down.
hope things improve, good luck<<<3