Instead of wasting our time to feel,you'd better to do the things you should to be done
Rather than spend time feeling,it would be better to do the things that we should do it better.
if you feel a waste of time,it may as well take action to do something you should do well.
may as well表示还不如。这个结构在英语专业课本《现代大学英语1》第213页。
Instead of wasting time on lament, it is much better to take positive action and pull yourself weight.
Instead of wasting time feeling better to do yourself this do
instead of wasting time to lament, it's better if you start to do the things you need to do by taking actions.