That rage is so valid - it's crushing to feel like your family's massive investment and your years of hard work have led to earning less than someone without formal education. The painful irony is that the chai wala probably has more freedom, direct customer relationships, and maybe even better work-life balance than you're getting in your engineering role right now. Your degree isn't worthless, but the system that promises certain returns on education while flooding the market with engineers definitely failed you - and that anger at being misled is completely justified.