"Speaking for myself, I don't need something. I need someone, and someplace, like this. Because this is well-fortified, and because you know very different things than I do. I don't think you know that I'm called Jonas. And now you do. I'm sure that you know many things I don't, that we'll need to survive. Key focus on we; I doubt anyone can survive on their own long-term."

Jonah improvised, making him sound uncertain. But he smiled again, hoping that they would be willing to form a group. Jonah doubted he could survive much longer, as his lack of information about survival really started biting him. Jonah could get nearly anything but food, which he really hoped someone here grew. 

"Irene, is that your name? May I come in? I am weaker than you!" 

Perhaps a more humorous tone would calm them down?