I think... People want to help, because they care about you and this is important to your life and your future, and because feeling helpless kind of sucks. Which, okay, those are valid feelings. But when you say no, they assume it's a statement on them? Like you're worried that if they get hurt they'll be upset with you or traumatized, or you don't trust them to help, or whatever BS they've come up with. I don't know how you could be more clear with them that you're thinking about your feelings and they need to respect your wishes, because this is ultimately about you.

However bad it is for anyone else, it's worse for you, of course your emotions are all over the place. Sometimes people just have to take everything personally.