You don't have to worry at all. Besides your parents, nobody really cares about whether you live or die, and even with them around, they might not be able to stop you. Some irresponsible parents don't care either.
I've told others twice that I had thoughts of CTBing. The first time, I told my GP, and she just gave me a lifeline number and scheduled an appointment with a mental health agency. However, that mental health agency never showed up, and they only sent me a letter claiming they had tried to call me, even though I didn't receive any calls during that time. They were just lying. Moreover, that agency said I had to reach out to them first; otherwise, they wouldn't consider it a mental health issue. It seemed like they didn't care, even though they knew I had tried to CTB multiple times. Actually, I didn't need these people to care; I just found them to be dishonest and hypocritical.
The second time I told someone was an accident, and I did encounter some people who cared, but they were helpless. One day, I was browsing Facebook and saw an ad for a depression test. Since I had never been officially diagnosed by a doctor, I thought, why not take the test? After filling out some forms, I started the test. Unexpectedly, not long after the test, a mental health agency tried to contact me. They asked for my phone number and address, and after several email exchanges, I eventually gave them my phone number. That was a decision I deeply regret! They called me, we had a chat. I have a very bad habit of telling others the truth, so I even told them my detailed plans. They insisted on meeting me, but I didn't agree. Naively, I thought that as long as I didn't give them my address, they wouldn't find me. However, an hour later, the police found my home. I was taken to the police station and stayed there for about two hours waiting for an ambulance. Then, I spent about four hours in the ambulance before getting to the hospital. Afterward, I was placed in a ward with security guards for 24 hours. Then, I saw a doctor, I told him what happened and my plans. After hearing me out, he gave me two options. The first was to go home and do whatever I wanted. The second was to stay in the hospital for one or two more days and possibly arrange me a more specialized mental health doctor. He also told me it was entirely my decision. In the end, I chose to go home. Then, I tried to CTB again at home, but the method wasn't suitable for me, so it didn't work. Currently, I'm trying other methods.
Only three people made me feel like they genuinely cared. The first was the person who called the police for me. Although I couldn't accept her actions, she did genuinely do something. The other two were the nurses in the ambulance. As for the rest, they simply don't care whether you live or die, despite their pretty words. It's just their job, and they don't even care if they do it well. Remember, while there are many good people in the world, there are even more bad ones.