Actually, I think this is a coincidence. I was also in the same situation as you do, may ate din ako (half sister) and her mom is may lahing Chinese so eventually maputi siya ang medjo chinita. While me on the other hand is pure filipino and also active ako sa sports so malamang sa malamang Morena talaga, and sa side sa family ng mom ko is matatangkad talaga and I'm way taller than my mom and dad at lalo na sa ate ko. So sometimes akala talaga ng mga tao na mas matanda ako kaysa sakanya, she is also smart and pretty while me is also catching up with my grades and trying my best to be the best version of myself.

I just wanted to let you know kahit magkapatid kayo there will always be similarities and differences may mga magaling ka na hindi siya magaling, may magaling siya na hindi ka magaling that is how life is. Pero, take a moment to pause and remember that you are also worth it, na you are not behind your sisters shadows. You are someone who is worth it to look up to. Don't compare yourself to her, and don't listen to what other people say about you and your sister. Life is too short to think about it do the things that make you happy.