I feel the same way at times when i look back, especially having read about bitcoin during its inception. I attempted mining but didnt have a rig capable of handling the load and lost interest when i couldnt do it on my own. Oddly, i had a similar exoerience when i had an opportunity to buy gold at <$400 per ounce. I thought "what would i do with solid gold boullion?". Several years later the answer would have been "sell it at $2000 an ounce". Still kick myslef over that sometimes. I try not to dwell, because it wasn't mine in the first place, so i didnt 'lose' anything, which is a common misconception. The best i can do is move forward and hope to be a part of the next wave!