You are not the only person who regrets not being able to hold on to Bitcoin early. I also had a good amount of Bitcoin at one time but I couldn't hold on to it. It is natural to regret that time. I knew a lot about early Bitcoin and I transacted a good amount of Bitcoin but at that time I didn't think about 2025 or 2030 what the value of Bitcoin would be at that time. I sold them according to the value of Bitcoin at that time and spent it in various ways. When I think back on those fucking days, I get very angry with myself. If I had the Bitcoins I had then, that amount of money would have changed my entire life and I could have spent the rest of my life in retirement from now on.
It's understandable, but there is no need to be angry or annoyed about what you did in the past with your Bitcoin. Think of it this way: you had some money, and you used it in the past because you needed to, and that money became useful for you in the past, and that's what matters. You didn't know about the future, nobody does, so there was nothing wrong with you using your Bitcoin when you could to do something useful for your life rather than keeping them only hoping that its price may go up. What if Bitcoin didn't reach here and declined and stayed down forever?
This is why I would say we shouldn't beat ourselves up for what we did in the past, which could have given us more now than what we had at that time, but it's okay, we at least used it for something good. It would be more regretful if we had lost our coins, and didn't use them for anything, then it would be fair for us to be sad or angry for losing them because those could have had a very high value today.