In any case, I have a complicated relationship with the past and the future. As far as past goes, it's there and you did it and you can know it, but you can't change it. And future, you can change, but you can't know it until it becomes present and then past.
I realized (not so recently) that my musical practice consisted of the following three parts: 1) practicing taking place in the present. 2) mourning the past in which I didn't practice enough. 3) fearing the future in which I would not be successful because I hadn't practiced enough. The problem is, #2 and #3 were encroaching on the present so much that I could barely stay focused on my present, real-time practice. Not only did it erode my playing time-wise (why bother to practice for two hours when I'm never gonna make it in the future anyway?), but it eroded the quality (I'll never be able to play this right because I didn't practice enough in the past!).
So what's a flutist/yogini (flowgini?) to do?
I'm gonna try this week to live like I sight-read- one note at a time, with my eyes looking only one or two notes ahead. If I think about what I can do that's productive and positive in this minute (and the next five minutes, say)... that's something that I can handle! In every minute, I have to embrace the present, let go of the future, and forgive myself (and sometimes others) for the past. That's a lot, but I tried it in class today, and it worked!
... then I came home and stuffed my face with ice cream.
And now I'm forgiving myself for the past and moving on. :-)