You are not alone. I have heard similar stories from others. They sold their BTC too early. I also have a story of 7 years of cryptocurrency. I have used BTC as a payment method a lot of the time and I caught some BTC, which was earned from buying / selling digital products. However, I spent BTC at that time. I could have made a lot of money if I had kept BTC.
This happens to the lot of us especially those who had enough crypto at some point but spent it between that 2017 high to 2018 peak prices. But there's one thing I like about crypto. It's that, there are always opportunities that would come even though it doesn't come now, it would come in the future and we have to be ready when that happens. My own is that, I had a few ICO tokens that were doing well and my expectations was that that bull market run would continue so I decided to let my bags run longer. It sunk, badly. I felt terrible for like 2 years but I'm ready to take on more opportunities as they come.