How do I deal with regret over not finishing my degree?

You did not finish the degree, the certification, the training that might have opened different doors, and you still think about what would have been different. The choice made sense back then, for reasons that were real. But now it sits as a regret, and part of you keeps replaying the road you did not take. Here is what regret hides from you: you are comparing your actual life to an imagined one where finishing led only to good things. That other life was never guaranteed to be better; it just gets to be perfect in your mind because it never had to be lived. Meanwhile the path you did take gave you things the imagined one never could. The unfinished qualification is a fact, not a verdict on your worth or your future. So ask a more useful question than what if: what do I actually want now, and does that door truly still require the thing I did not finish. Sometimes it does, and finishing later is more possible than you assume. Sometimes the door is already open by another route. Either way, put your energy into the next real step rather than the old imagined one. The past choice is closed. What you do from here is not.