You were excited to finally be in the academy. Today, the teacher had explained about chakra and how it was used. He'd made sure to stress multiple times, however, about it's dangers.
Never initially practice without supervision, you remembered hearing countless times.
But with your knowledge of the anime, along with being older than you seemed, you thought you'd be fine.
Besides, what was the worst that could happen?
"Chakra is so cool! I'm going to try channeling it through my body and be like Sakura, and Tsunade too!'
Epilogue:
It was a terrible day for the new genin as they were called to clean up the mess left behind on the Training Field. One even threw up at the mess left behind. "And this is why we always need supervision when training with chakra early on," their jounin sensei sighed. Damn kids, who refused to listen to their teachers.