Negative thoughts and emotions are something we come across time to time in our life.what's important is that how we overcome those feelings and effectively deal with them as soon as possible. Here are some ideas that i follow and may help you.

• Be Stuck - Most of us try to run away from our this feelings and choose to ignore and distract ourselves with Book, web series, games etc. and this feeling never goes away. 
• Face it - Facing our feelings head on is the most effective way to deal with it. spend some time alone and think about the reason u may be feeling this way.