I suffered a string of ill-timed deaths when I was a teen. It hurts and it feels like it will always hurt...and, to be honest, it always will. But on the other hand, you are still alive. That means that you are still subject to the truest rule of our reality; you are still subject to change.
I'm sorry that you're experiencing this, stranger. It's not fair and I've had similar fantasies about being able to save those beloved souls that I've lost. Things don't really work like that, but what we do have in our favor is the fact that these feelings, as difficult and heavy as they are, will inevitably change over time. A day will come when the memory of those you've lost doesn't stir tears, but instead spreads a smile across your face. The memories you have are precious treasures and they, like those difficult feelings, will also grow with you.
If you're feeling anything like I was back then, then I'm sure it might be hard to believe this, but it is very much the truth. For me, this misfortune eventually grew into the understanding that there is nothing more important than the people who will cry when your name gets called. The breathless darkness of loss is a darkness that can be cut like any other. You wake that light with the trust and love of those who are still with you and the trust and love you have for yourself. Make sure to do all that you can to have people who cry for you some day, because there is nothing more powerful, healing, or moving than the cherished connections we are lucky enough to be alive to share. It doesn't feel like it now, but the day will come when you can look back and smile at what once shook you to sorrow. What once felt like a punch to the gut will some day feel like a pinch; something that only hurts enough to remind you of what really matters.
You will suffer like this again someday, just as we all will. Or, most of us, at least. And in spite of that, you will also find, someday, that you are surprised by how ok it all seems in the rear-view. You'll get through this, dude. This stranger believes in you :)