How to let elder sister to love her baby sister?

My parents told me I used to hate my youngest cousin which is like a sibling to me (and also, I was the youngest grandchild before my cousin pop out, so I like the attention the adults gave me), and everytime my aunt visit my house or my parents visit her house, I won't let my parents touch or carry her, and whenever I saw them carry her, I got super jealous and screamed! I don't even like her at all, let alone play with her, and I always left her out when it comes to playtime with my elder sis and 2 elder cousins (my youngest cousin's siblings) because well, she's still young and people are giving her lotsa attention. Then gradually over time, I just got used to her presence when I grow up and love her unconditionally no matter what the circumstances til now 🤣😅 me and her are 4 years difference fyi and I love her like a sister.