Major fomo

So I’m a 13 year old girl that’s friends with a bunch of 15 year old boys. There all hanging out at my stepsisters because they’re friends and I’m having major fomo. They’ve been sending me pictures of a papa johns they ordered and been saying “Jealous yet?” And I don’t know but I have depression too and I’m not allowed to go, I’m starting to feel like they don’t want me there...