Omg I have the exact same problem!!! I've been doing gymnastics for years and stretch all the time, but I can't get my splits. One thing I try to do is do stretches, and then also come up with stuff that stretches my legs.
I would suggest stretching as much as you can until you feel loose, then...
I got a lot of non gymnastics related stuff but I it a new Leo, a new gym bag, a gymnast ornament, a gymnast sweatshirt, and a Gabby Douglas poster, because shes like my role model! Also for my birthday just a few weeks ago I got gymnast PJs. :)))