wow. you guys are harsh. I do think that messing with diuretics and other substances should be done with caution and under the guidance of someone with experience. Honestly though, I think it is great that you have the motivation and the drive to do what you have done so far at such an early age. So many people at such a young age are doing far worse things or.... nothing at all with their lives.
Listen to your body though. I know some people are believers of "working out until you puke" or "if it doesn't hurt push harder" but those body signals exist for a reason
Also, some kidney damage is irreparable, be careful!