I'm not allowed to do this, but I have to. How should I refute it?

what are you going to do？ But others think that you don't think this will succeed, is that what you mean? If so, you can directly refute it. I think I can try. I am a person who won't look back until I try. If it doesn't work, I'll bear it myself. But in fact, you can listen to other people's opinions properly. If there are really many people who don't let you do this, but only you have to do it, then you should calm down and think about it. Do you want to do it?