We cannot be faulted if we take ourselves too seriously! After all, this is the only life we have!! One suggestion would be to follow Dadi of Kapil Sharma's popular comedy show on TV. When told, "Dadi, think second time," she shot back,"When life is one, why think twice?" For the believers of more than one life, one may say that we had chance before, we shall get chance again - why worry? If nothing works, we have the liberty to become more philosophical than usual - Many like us had come and gone, many like us will come and go, let us not get stressed!!!
Star Plus is now beaming the epic Mahabharata with new castings. "Dharme cha arthe cha kaame cha mokshe cha bharatarshabha. Yadhihasti tadanyatra yannehasti na tadkvachit" i.e. "O scion of the Bharat race, whatever dharma, artha, kaam and moksha exists in the world, exists in the text, whatever is not in the text does not exist elsewhere." We can watch all episodes here (Link) and take life easy. Of course, we should avoid 'what-if's and draw conclusion out of it. For example, if the battle of Kurukshetra could be avoided if Dhritarashrta dealt Duryodhana differently at various stages - Dhritarashrta could become neither a true king nor a true father. Probably if one is true in one, he automatically becomes true in other.
Endnote: "We play our parts here — good or bad. When the dream is finished and we have left the stage, we will have a hearty laugh at all this — of this only I am sure." - Vivekananda in his letter to Sister Nibedita on 28th August, 1900 (Link)