Sibling

I have a sibling who is jealous of me, its very irritating n frustrating to say the least... Its an old thing I picked up when I was younger, up until today, she wants what I v, she wants to do what I do, from appliances to knowledge to anything, if I do it so does she, I try n limit her from knowing what happens in my life but unfort somex someone informs her. She makes it a point n run n tell the world about the happenings in my life, ppl who hardly know me know everything about me..... Grrrrr she is elder but hasn't grown up n dsnt act mature