Would you be angry in my situation? please I need advice!?

Yes, I think it is silly for you to be mad about this. Your sister may be getting free stuff, but what kind of life does she have? Not a great one, as you have described. Yes, you're working hard and paying a lot of money to do something significant with your life, but that doesn't mean you won't be able to afford or have time to raise a family, so you shouldn't feel like she's the one who's getting everything without working for it. Don't even worry about what kind of life your sister has and don't feel like you're getting the short end of the stick. Because you aren't.