it is indeed true that my tax return was only $15 dollars, however it is/was not the only money I had/have available for something like this.
I am (currently) in a situation where even if I end up completely broke (which does happen), I can still depend on my parents for the absolute necessities. So like, I can have literally zero dollars in my bank account but I'm not going to be out of food or have nowhere to live, basically.
in the long run it will not be a very sustainable lifestyle but that's okay because I have plans to improve things. but that's a whole other story. basically my point is, I don't want to be broke because of donating, but it also isn't the end of the world if I'm broke.
and I actually managed my money pretty well this month.