Oh My, this is horrible, I am so SO sorry you are having to deal with this at the tender age of 14, All I can say, is that God doesnt Kill to hurt you, it was their time up on earth and it doesnt make sense and will feel unfair, but our time on earth is like a little second of what we are going to be experiencing up in Heaven.... Earth is just a "tester" Its a challenge for all of us humans who are weak, he is making us stronger people, and the happiness up there, well, its beyond what we can imagine!
Just remeber this, there are people out there who will help you, never EVER feel alone, right! Its a scary world yes, especially at 14, however I think in a weird sorta way, this may just be the making of you! People who experience these things are destined for great things, especially if they continue to have that faith! I lost my grandpa at 21, I miss him dearly but not once do I blame God, no-one is too blame.... His time was up!
God bless you, and please if you ever EVER want anyone to talk to, please private message me, I would be only to happy to help you....Seriously I think this is going to make you a very strong person!
God Bless
Jonno