A little saddened because I sold Bitcoin way too early.
I wanted to get out, but if I had set the bar a little higher...
Of course, if you had a crystal ball you could make a lot of money.
I feel you, didn't we all? That's a thought that was haunting me for a bit "if only I had gotten some BTC a bit earlier, and sold at the peak.."
But I think overall, those thoughts are more negative than anything. You can't do much about what happened in the past, you can only change the present.