The way I see it is that what happened in the past can't be changed. We can deal with how the past shaped the present and that's all we can do about the past. Obsessing over regrets about what happened in the past doesn't help at all... just makes it harder to deal with the present. What happened happened... what we did we did. It may have been the best we could do at the time.
There can always be joy and satisfaction found in life regardless of our circumstances. Nothing helpful and profound is coming to mind right now and I won't waste your time or mine with more banal and trite phrases of encouragement.
Just... life begins... now. What happens now and whether you see it as fulfilling is up to you

It's never going to be perfect for you or me or any of us