When you're tapping into negative thinking then you're often thinking about something that happened. Or something that may happen. Or both, all jumbled up as your mood and thoughts sink. To snap out of that put your attention fully into this moment instead. This takes you out of the past or future and into the now.
This video talks about it more
Also in this video I talk about specifically how to change thought patterns from negative to positive.
I go over a very power and fast technique for you to change you thoughts pattern instantly from negative to positive.
Do this and watch your life begin to unfold in magical ways.