I am stuck and I don't know what to do?

I think that you need to be realistic. It's easy for people to lie to your face, and even easier over the internet. Your mother is just worried, she doesn't want you to get scammed. I think that perhaps, since 30 dollars is not a lot, send him the money. But, if he asks for more, it is fair to become suspicious, and I would refuse. Be wary of people over the internet with sob stories.