My brother got one of the girls he talks to to buy him an iPhone X

And here I am, trying to battle my mental health issues and get through my degree, literally not getting a day off because of all the voluntary teaching work I do, while he makes fun of me for being broke and looks for ways to pick arguments with me.

Am I just doing life wrong or something? Why is nothing going my way? Why can't I find peace even in my own home? Do I just do too much?