Is there any other person but me?

I'd like to hide my age but my name is Angelica and I'm suffering from favouritism, depression, stress and anxiety..I don't know what happened to me, I always used to be so happy and perfect but all eyes are on my sister now.. Even though she has lower grades they still like her more do I have to find a cure for cancer just to be loved again..Stop hurting me I'm tired already!!