We have predetermined notions about what is fair, what is difficult, what is possible, what is ethical, what is good, what is bad, what is ugly, what tastes good, what looks good, and on and on. So don't assume that your goal setting isn't impinged upon by these already-established parameters, too.
It may be worth it to set aside a time to write your ow estimations of what these are in your own mind and life.
