I feel unappreciated by the people in my life, what should?

Being the eldest sometimes I feel the same way. It's not your fault though, you shouldn't be upset that they don't see what you see in yourself. As long as you feel your doing what your suppose to be doing that's all it matters, they can say anything they want. if they don't appreciate what you do for them then that's thier problem not yours. They are taking you for granted as of right now but ounce you complete school and maybe move out that's when they will realize and will appreciate you.

Tell them how you feel if you can. Maybe just ignore them. If your brother is lazy and does nothing then you should not try to feel appreciation from him, he probably doesn't appreciate himself so he most likely can't appreciate you. Once you move out or get married, people will appreciate your working attitude a lot more. Don't worry about what your mum or brother says, if you know you are doing the right thing then there is no need to feel unappreciated.

Appreciate yourself. You're the most important person in your own life. Don't forget it.