I was in your place 3 months ago.. Mine was also 16, we had a special bond, that cat was my baby, it still hurts terribly. One thing I would recommend that has helped me in an unexpected way is having a small space in my room dedicated to her.. A nice carved wooden "urn" box, one of my favorite pictures of her framed and her favorite toy next to it.. Also a bud vase I rotate flowers from my garden in. Not sure why it helps, maybe because it feels like one last way to honor them and do one more thing for them, and that feels nice.

Hang in there, there's no easy way through this. Hopefully the above suggestion can help bring you some peace, I'm still working through regaining my own.