Hi!
Its understandable that you dont feel like you could do well this year if youre going to feel like a third wheel.
However, YOU aren’t defined by your family background. You have your own strengths and weaknesses.
That said, the school rejecting you has nothing against you personally. So go show them what youre capable of! Prove to them that you belong there on your own merit. Keep getting those top marks.
Work for yourself. Youre the only one who will gain or lose from the amount of effort that you put in. Why not do it for yourself?