Biggest regret

I think my biggest regret right now is in both school and sports in high school I could've done more. I did just enough to get a few A's and a couple B's in high school to keep a good GPA but i feel like if i would've actually applied myself I could've done a lot better.  I put a lot of time in to track in high school but as I look back now I feel like there are things I could've done better and worked harder at. I wish I would've had the knowledge I have now and been able to put that towards my training. I don't feel regret because I am doing what I can now to do better at both of these things. I am working harder in my classes and with throwing to get better and improve my marks. I feel at the time we tell ourselves lies and deceive ourselves so we don't realize till later what we were missing out on.