ok, this is a do as i say, not as i do, because i am very poor when it comes to standing up for myself with my sisters and setting boundaries. but in an ideal world i fantasise about taking the younger one to lunch. she has jealousy issues and constantly puts me down. her thing is "you're book smart, but have no common sense. at least i'm street smart" (a point which i think is debatable). in this imaginary conversation i tell her i love her just as she is and she doesn't have anything to prove. in fact, setting up false competition between us just makes her look childish and petty and causes me to feel anger and resentment toward her. i'd like to have the close relationship we had as young children, but that can't happen if she continues to undermine me in order to prove herself some kind of expert about everything. it's ok not to know everything, and it's okay to admit when i have good ideas or when i'm right about things. that doesn't detract from her. my knowledge and ability doesn't diminish her - she only thinks it does. and trying to prove herself bigger, better, more is what actually diminishes her - it loses her respect in my eyes and the eyes of our family. she should be content with her own talents and skills - it's a weak person who tries to make themselves more than they are by tearing down someone else. it exposes them as a fake and a fraud. she's better than that. you want better for her. she can be better. she should act it. then stuff ice cream/cake/tiramisu in your mouth and let her mull it over.

"it's a weak person who tries to make themselves more than they are by tearing down someone else."

Yeah you're right, thank you for pointing that out. She doesn't have enough confident to be herself. I don't think I can love her the way we were before, even though she's not that bad. There was 1 incident: 3 years ago when we were about to move to a new home, I got myself 2 little kitties that I love so much. The mother cat couldn't take care of them, so I took them & trying to persuade my parents to keep them, at least until we can find somebody reliable and like the idea of having 2 new kitties. They almost agreed. Seeing me getting attached with the cats, I don't know what my sister was thinking. When things were going on smoothly, my sister was at it again. Waiting for me to turn around someday, and she took the liberty of taking the kittens away to a woman that I never met to take care of them, saying she would like cats. Just recently, It turned out that the woman abandoned the kittens cruelly since they made a mess in her house, only that! And I know she was telling the truth. She spilled it out with a happy, satisfied expression & let me hearing that. I could't help it but want to cut all ties with her.

Now thinking about that, I just can't. It'd sadden my parents a lot. But how can I love a person like her while the fact is she can make me sick. Sad thing is: whenever I directly criticize (not trying to set up competition of any kind), she sneaks away and make herself a victim!! She'd alarm the parents, her friends & her stupid boyfriend so that I'd become a guilty one. Never for once for a long time that she shows content with her own abilities. And yet she appears to be outgoing, active with other people. I never meet that kind of personality except my sister. Or maybe I'm exaggerating a bit here, maybe somebody that's not quite close would be more open-minded toward her, I don't know....

There are a couple principles I learned about in the Bible that might be able to help. Proverbs 15:1 states “An answer, when mild, turns away rage, but a word causing pain makes anger to come up.” It let's us know that to keep ourselves from making a bad situation worse, we want to try our best to keep a mild temper so that we may possibly calm the situation down. Obviously, doing so is challenging and may not work immediately, but still, it's better than widening the bridge that's there.
The other point is to find out exactly why that distance was created in the first place. Proverbs 19:11 says, "The insight of a man certainly slows down his anger, and it is beauty on his part to pass over transgression." Understanding if it's her way of coping with her own insecurities, desire for attention, or negative feelings can help you to find ways to try to mend that broken relationship.
Overall, even if she doesn't respond in the way you would hope, trying your best to remain calm actually will give you your own inner peace. It'll keep you from allowing yourself to use up your energy being angry, and also will speak volumes to others that are watching you and see your maturity in the situation.

This is the 1st time I let myself talking about this issue, I feel like I cannot take it with her anymore. But thanks for for advice, I'd try my best to keep calm.

i don't know about staying calm - her actions with the kittens was cruel and sadistic. and i wouldn't want a close relationship with her either - i love you, but i don't like you - sounds applicable. i still encourage a confrontation (that word is neutral, and that's what you're aiming for), but prep the ground - ie: tell your parents, friends, any one who will listen that you've had enough of your sister's act and you're going to talk to her about it, but given how cruel and vindictive she's been in the past you're seeking their advice on things to bring up and ways to help you communicate to her that she doesn't have to build her confidence on tearing at you, playing the victim, or exaggerating the faults of others. that you want to see her grow into a more mature and responsible person who can accept responsibility for her actions and you think this conversation will help that. so when she runs to your parents that you're picking on her, that you're mean and said awful things they're already aware of the situation and on your side and can back you up.