Struggling with Jealousy

Hey Girlies, right now around Christmas time I am really struggling with jealously over everything that this one girl, Sarah has in life.
So.....
He Dad is in realestate and makes more then most doctors. Her house looks like a red brick Buckingham Palace. For Christmas this year she got a new iPad, Apple Watch, more Tommy Hilfiger clothes then imaginable and what she called a bunch of little gift. Her little gifts are things like pandora rings and a Tiffany and co necklace. She is one of four children, yet she revives all of this. I am an only child and still would never get half of what she gets. I really am good friends with her and she is down to earth. Physical she is a little overweight, but beauty at the same time. That what makes it so hard. To her the things she revives are small because to her family $500 is 2 pairs of jeans. Like this year I got a new phone, just the normal iPhone 7, then I let her have a go on it and she said she liked how light it was. She went home and mentioned it to her Dad, then the next week he had brought her the iPhone 7 plus 128gb. 
To top all of this off, she even has this really steamy thing going on with this guy. I'm not going to go into detail about how she knows him or the fact that he's a little older. But she's says she doesn't really want to take thing further with him because she's just not feeling it. If I had a guy that was hooked onto me as much as he was I would be great fun and not just ditch him because I wasn't feeling it. 
Girls I need tips on how to deal with my jealousy????