I threw away 30 coins during the first year of mining when you could get a coin a day on a half decent box... It's always made me annoyed at myself because I could buy a lot of pizza with those coins.
I sold 5 coins at the first peak of $31/BTC. Thought I was pretty damn sly for getting out ahead of the following crash ($8/BTC). Joke's on me! I've now lost out on $1230 and counting.
And if I was you, I'd do myself the favor of not torturing myself about what could have been.