Always keep in mind that our innver voice affects our daily affairs, our happiness, our success, our achievements and everything. So it should be always positive. The best way to overcome the lack of positiveness is self talk. Let the mind think what it desires. But we can purposely talk ourselves positively.
For example, when mind says, 'Oh God, don't know how the day will be....? We can purposely say, 'Today will be the best day in my life.'When the mind says, 'This won't be possible for me!' Let us purposely say, 'Oh, I can do it!'
When the mind says that the life is like a desert. We can say that the life is like a garden of roses.
This way, one day mind itself will start thinking positive. You know, mind is just like an innocent child. It acts in the way it is tought. Its just like feeding a child with constant positive thoughts.
Just apply this trick and let me know. I am available on following email ID.
-Prasad Kulkarni