Any advice for a girl that is jealous of her cousin?

What you need to do is not care what Valintina is doing. If you want to write a book. do it. if you want to live in New York. Go ahead. Its a big city and noones stoppin ya. You give Valintina too much credit, she probly doesnt realize what she's doing, or maybe she does. but do you really want to give her the attention? Just ignore what she wants and do whats good for you and what you want. Tell someone about whats happening. Because by the way you ranted in this question i'd say ya need it. and im not being mean just blunt. Be what you want to be and dont let jelousy or upstagement get in your way. when they compare you to her take it as motivation to be urself. Dont try to not be like her, it will only frustrate you. Just be you. and if ya dont know you that is, well neither does every other teen. So dont worry about it, i know that it seems hard and that your probly ready to explode, so let it out. Rant to the skies, run til ya pass out(not really it sucks when that happens), do something to let it out and help yourself. But remember that other people are going through the same thing everywhere and people are going to judge you and are going to be rude, but you've got to learn to deal with it and not by self harm. instead use it as motivation. I remember my grandma got me a pair of pants that where HUGE a couple years ago and i mean huge. and she said id grow into them. well it hurt my feelings because to me it meant she thought i was going to be that big when i got older, but then i got mad and got to where im a healthy weight :) and i know the situations are not near the same but use negetive stuff to make a positive impact on your life. I really hope this helped