I bought lots of bitcoins when BTC was at 2K$/BTC...
If I didn't spend most of them I could now be RICH! (or even millonaire)
Don't act like me and try to keep the invests as long as possible, I could have earned LOTS of $ but I earned about 500$ instead.
I can't be angry with myself as I didn't lose anything, but I didn't earn as much as I could have earned.
You do realise if no one was spending and everyone was sitting on their coins, bitcoin would be worth zero and only few guys would know about it? If not for you (and others) who were actively using bitcoins, it wouldn't get to where it is right now.
And if you've spent most of it, then it clearly wasn't a long term investment for you. So it's just another case of "would've, should've, could've". There isn't a single person who didn't miss out on great opportunities to get filthy rich. Whenever you bring a subject of Bitcoin in public, there's always at least 1 guy with "Maaan, I was so close to buying bitcoins in 2010 but I didn't, I would be billionaire today" story.
Don't beat yourself up over this, life goes on.