how sad you are , I am quite a sap when anyone of my animals dies. I even cry when I raise wild bunnies, and then set them free. I'm happy but sad to see them go and worry how they will be.
It always feels very sad, but hey be so very thankful your going to be 18 in 11 days and YOU are healthy and able to enjoy life, as many are not.
Be sad for awhile, thats totally normal, and its good to grieve, as long as you get happy again soon.
**Remember there are alot of little uro's out there that are in need of a GOOD home and someone to care for them. 
If you feel extremely sad and would like to talk with some great people, who will listen, to everything you have to say as long as you want to talk, then try going here.
Bunch of awesome buddies of mine there for ya, as long as ya need them.
Pet Lose Support
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Eve / PHEve