I too recently had my left mandible replaced with fibula bone and free flap reconstruction up at Mayo. Yes, it was scary and not the most pleasant experience of life. However, two years out and I am doing fine. Please, if you have questions or concerns don't hesitate to ask me or anyone else in this group for information.
Believe it or not, my biggest concern was if I would ever be able to walk normal again after removal of the segment of leg bone. Turns out that was a non-issue.
Anyway, I am sorry you have to go through a battle like this at such a young age. As Winston Churchill would often say, "Courage". Later when your friends whine about a cell phone or pizza not having enough cheese, you can just smile at the triviality knowing what you have been through is a mountain most would not climb. Good luck.