Hey PinYoda
Never doubt yourself until you see the result. You need to start acting and see whether you really can do it or not, because if you were to sit were you are and just overthink the problem without solving it, you'll only be lost and you'll be going around in circles forever, but if you stop thinking and start acting, you'll find the ultimate answer

What might be applicable to your sister doesn't meant it also applies to you. You said that your mom and sister both love you individually, right? They can be great supporters, and your mom will most likely not say what she said to your sister Emma. Your mom only wants to see her girl perform well in life, that's why she seems so hard on her
And you have ambitions, so don't let anxiety and depression get in the way of getting that awesome business degree, okay?