You are going through grief reaction . It is not an illness
With time you will regain your normal selfi
Getting an insight to your problem is the first step for your recovery
I think you're just grieving, but I really don't know. I'm 16 and far from a doctor so if you think you are depressed go see one. I am really sorry about your family. Have you tried talking to your boyfriend or your parents or your friends about how you've been feeling? Talking to people helps. You can be happy again, but you need the support of everyone who loves you. Please feel better.
PS if you ever wanna talk to nonjudgemental strangers, please message me and I'll be happy to listen.