And, to qoute that guy above me, how many times I've masturbated. I'm sure that'd be really interesting for every guy.
I would need to learn vocabulary for numbers exceeding over bazillion.
The number you are looking for is somewhere between a vigintillion and a centillion.
I would like to know how much time I wasted doing other things (e.g. playing video games) when I could have been bettering myself, and how much time in my life I did actually use to better myself.
None.

Master has given Dobby a doctorate! Dobby is free!
I would like to know how much time I wasted doing other things (e.g. playing video games) when I could have been bettering myself, and how much time in my life I did actually use to better myself.
To answer those [for myself, at least]: not enough, and too little...in that order.
Also: How many times I wanted to just say "fuck it" and stay single for life. Girls are trouble.
How much time I spent doing homework.
How much time I spent playing StarCraft.
It's going to be a close one.
Win by luck, lose by skill.