@marikofujimoto I might be late, but I wanted to leave a message for you. I want to say that I completely understand your position, and I feel for you.
My parents are just the same, they keep comparing my and my brothers to each other, and have this “image” of us. I am the “stupid” one, of course, so in the past years, I tried to please them, studying well, taking good grades, did everything to get praised, and despite me being better at studying, I wasn’t satisfied at all. So I suggest you: don’t bother.
Don’t try to please them, don’t try to make yourself look good in that specific field, parents and family members love us, but they also are the ones that without knowing hurt us the most. So I suggest you to just do whatever you like to do, and go on with it. Ignore them, don’t even think to compete with your sister, as you said, she is she, and you are you, and however good she might be, she will never be like you in any way, your style is yours, and I’m certain your art is awesome. You enjoy it, you like it, put your anxiety in it and crush it. Parents never change, whatever you do, you will always carry that label they gave you, but you’re not there to try and change their mind, your life is yours, not their, you know who you are, what you like, and how good you are. Others know or will know as well, so keep going, and don’t stop!