How do I explain to my toxic family that I am leaving for a new life?

You be completely blunt and honest with them about it. That is the best way going about this. You can tell them verbally that they are hurting you and that you need to leave so you can have a better life, or you can leave a note for them when you decide to leave. Or if you really feel like it, just leave. You do not need to deal with that, you can have a much better life if you choose to. Make sure you have goals set out before you do decide to leave so that you are not stuck. Be smart, you are smart.

As someone who grew up under a family who was judgmental and tried to choose and change my own lifestyle, I understand the desire to leave. Ask yourself some questions: ie. what is it that makes them toxic? What do you feel whenever you are around them? How do you feel as though you should react after conversations with them? Would this decision be good for you in the long run? Toxicity in families is hard to deal with, especially when you are under their roof at all times. Keep these questions and any other possible question you may ask yourself in mind when having a conversation with your family or finding yourself in a distressed mood.

First of all, if you feel that telling them alone in person could lead to physical or verbal abuse, tell them over text, on the phone, or call the non-emergency police line (usually 311 in the United States) ask a police officer to come with you for protection. During the conversation, try to avoid starting an argument, because those usually go no where and are unhelpful to you. Instead, avoid accusations and be confident in your new plan. Use affirmative statements like "I am" and "I will be" to make sure that they know it is not up for debate, and it is not their decision. Sometimes it is possible to eventually reconcile with family, but never be afraid to completely remove truly toxic people from your life, you will be shocked how much easier it is to take care of yourself without toxicity weighing you down.