Chris4329,

Nah, not at all true. Many of us here have experienced and truly know from experience that there's no hard-&-fast-rule regarding time, symptoms duration and/or healing & recovery possibilities over time.

Sounds like you also have young-age of injury on your side.
Hang in there, you'll be better provided you are at the least taking good post-TBI/Concussion selfcare, as Mark has faithfully informed on here again & again.