Not wasted all the time and actually studied. I am pretty good even at procrastinating starting things I like doing.

Also, when I was 17 one of the better colleges had a yearly competition in networking (specifically with Cisco devices) where people who scored above 56% would get some larger amount of bonus points at that college. Unfortunately, the number of places was limited, so I didn't want to take anyone's opportunity away by signing up, as I wasn't 100% sure I could do it.
In the end, 14 people who signed up didn't even show up. Fuck that!

Perhaps I could try when it will be held next year. Yeah, future tense. I am still 17. But it's still the same morale problem. Limited number of opportunities. Not everyone can get the chance, perhaps because of me.
I don't know what to do.
I am not even sure I regret the choice I made. On one hand, I lost an opportunity myself. On the other hand, it feels like I made a right, albeit dumb decision.

So yeah, back to the question. I will regret fucking up my life. I know I'll do just that.