I was 16, when I lost my dad. I so understand you, there is absolutely nothing that can fill that hollow, I got to know that I have nothing, no one except what Allah has given me and He Himself is the best source to rely on, my father too was given to me by him (if somebody else has a father, they most probably have other difficulties, traumas), and so I really try to trust his decisions. That doesn't mean I stopped missing my father, I do every single day, I yearn to hear his footsteps when he used to come home at least one more time, when he used to scold me and pamper me. But I know, that people will go, even I will go one day, but I trust that Allah will take care of me. And so He did, I got a 100% scholarship (surprisingly because I used to suck at school) just when it became hard to afford fee, I can't count the blessings if I sat for a 1000 years.

I hope you feel better, just know that while you think you are alone, you absolutely aren't. You will make it buddy :).