I am the youngest of two sisters

When we were kids, I often used to be annoying. Seeking her attention being jealous of her friendships, and even act like a little bully sometimes

I agree with what has already been said, your parents or any other adult supportive figure should take some charge. You need your space

Maybe try to speak to her even if it wont be easy.
Young people deal with a lot of insecurities and fear of flaws, and they accumulate social anxiety at school or outside and often "explode" at home, but sometimes they are confused also about this, since they also need peace and quiet to carry on
But being respecful is a must