I'm 16 and I don't beliave in tru friends... "my best friend" was gonne in Spain... and now she returned after a year and a half... and she haves 2 good frieds me and a nother girl... me and that girl don't get along... and now I'm feeling that she is staing more with her than with me... and I'm trying to get along with that "creature"... but she always has something to do when I tell her to spend some time with me... I've talked to her and I asked if she isn't my best friend any more... and now she is angry with me... what can I do... I want to give her some time... but we don't have much :(...

You could consider practicing just being this girl's friend. It doesn't sound like you're doing a very good job of even that, much less "best friends".

A friend doesn't give other friends crap about how much time they have available, they just enjoy the time they have.

A "best friend" doesn't have to be jealous of the other person's time, you are "best friends" after all, so you look out for one another and go out of your way to make the other person as comfortable and happy in their skin as you can. You don't give them guilt trips, right?

So, for now, since your friend is clearly busier now than she used to be, how about you practice being "FUN" to be around with what little time you do have instead of spoiling it with this stuff?