A truth of life is that, at any point in time, we leave behind a wealth of opportunities, almost infinite chances.
And a second truth of life is that we often care much more about what we are leaving behind rather than what we have with us.
I guess the point is, why are you doing what you are doing?
If it is an intentional and purposeful choice, cherish it and dedicate all yourself to it. With no regrets for what could have been, if only.
If it is not an intentional and purposeful choice, you still have a wealth of opportunities and almost infinite chances to pick from.
The time you are not answering this question is the time you will feel incomplete.