How to control negative thoughts

THOUGHTS:-

In our day to day stressful life we are surrounded by many of people having good or bad thoughts mostly bad thoughts people. we unknowingly merge with them and become sad and sometimes the situation is so bad that even we can't think positive and unknowingly get stuck in them.

THOUGHTS generally created in mind by what kind of environment you leave suppose you leave in then group or area where every one is negative and not progressive just sit ideal all time not doing anything, either you are positive people after sometime you become one of them and vice versa if you are living with positive people sometime it depends on situation you stuck suppose its your exam you not prepair well and you just thinking about what type of paper will coome rather then you study you just thinking so you cannot invest those time in study and spend all the time in thinking so next day althought those question come in exam those you prepair but just of negative thinking that you don't prepair well you cannot able to attemp those question in exam that you prepair and there are many different different types of situation that we face in our day to day life and in mind there thousands of thoughts related to those situation generates automatically and in mutiple forms .

SO HOW CAN LET THOSE A SIDE AND FOCUS IN PRESENT

Some of ways that i applied to overcome from these kinda problem are:

whenever negative thoughts come in mind divert your mind from thinking about results to doing the work which you are doing just say your mind if i cannot doing this thing i cannot face the situation which is coming in future.
If negative thought is coming just sleep but before sleep say "jo hoga dekha jayega" because sleeping is best healer of anykind of thought.
If then also negative thought coming just share those thought with those person which you trust and say don't give me sugession just listen and support me unconditionally.
If there is situation that no person to hear you or you don't trust any one go in the room lock your self and take paper and pen and write down what excatily word to word what you are thiking and if you want to cry just cry and write and then after writing just burn the paper which you written , you will fell relax.