why human get nervous within small thing

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IT,s true but this is life every time you can,t be happy which is not possible so many people do like that you have to suffer from every step of life .this is the only way which is teach you something so we can be aware next time : is it necessary that without going wrong can we learn something? how do you know about that because if nothing happened with you so next how will be you aware : don,t be think more over life it,s just happened not in every step but time to time: have you solution for this type problem: this is my personal expereience.