I’m sorry for what you have had to ensure. Bullies are cruel but thankfully you’ve left them and that school behind.
Naturally, you’re worried about meeting “bullies” at your new school. Your primary concern is that if you were to interact with “bullies, they would destroy everything.” Essentially, at this point your happiness is dictated by others. If no one bothers you, then you’ll be happy. Your happiness should be dictated by you and not by others. Ideally, what others think or say to you should not matter. You should be immune to the opinion of others.
Part of the issue is related to self-esteem. If you felt confident about yourself and your abilities, then you would care less about what other people think of you. Another aspect of this problem is that you’ve never informed your family about the problems at school. You’ve also never received help for the anxiety and depression you experienced related to bullying.
You need to be proactive in this situation. My recommendation would be to tell your family about past problems and potential new school problems. They may be a great support system for you but they can’t help if they are unaware that a problem exists.
Also, I would recommend entering psychotherapy. It is important to address self-esteem, anxiety and depression issues. Those issues typically do not resolve themselves. They often require professional treatment. Mental health professionals are trained to deal with these very issues. They can provide you with helpful advice and ultimately therapy could improve your life significantly. A therapist can help you to learn the right way to deal with bullies. It would be an ongoing correction of your behavior when in a confrontational situation. You will no longer be alone with this problem and will have your therapist to help.
You don’t need to suffer any longer. Tell your family, and receive the help that you deserve and that would make your life better. With the right help and support you have a very bright future. I have dealt with many clients who have had experiences very, very similar to yours. They are all now living secure, confident, happy lives. Please consider my recommendations. I wish you well.