how to deal with regret - why didn't I buy a year ago?

A year ago a friend of mine told me about the alt coins litecoin and ehthereum. at the time they were under 10 dollars. I had a good amount of money and was considering investing to them. But I was hesitant, this is very risky I could potentially lose $300 or so dollars.

Going against my gut I decided not to invest in them. As time went on I got busy with college and seemed to forget about coin base and concurrency altogether. I could have made a couple thousand dollars off of the investment, which really angered me. But I cant let my anger get the best of me. I decided to start putting in some money into both ethereum and litecoin to hopefully turn a good profit.