Very complicated but simple if you understand and accept things..you just have to accept stuff happening and not blame anyone or anything..once you accept things then life is easy to understand and you enjoy it..everything has good and bad..a coin has two sides..all these are true and very well said..in life we need both happiness and sadness..you just can't expect to be happy all the time..when you have both that is when you learn to balance out things properly..you need to understand that what ever happens to us is destined and you can't change it come what may! You can change only a few things but not all the things in life..you might me correct or you might be wrong..lets just understand that what ever happens is meant to happen and you can't change it..if something good happens be happy and if something bad happens then feel sad about that and do not regret..nothing ever changes if you regret and you cannot cry over he spilt milk..! once the mistake is done then you can only realise and make sure you don't do it again or just stay with it and feel guilty about it or act as if you don't care..
What we do depends on us and no one else its better we change and mend ourselves for a better future...Instead of cribbing and crying you can always have a hope and have a fresh start so that you forget the past and move on and look for a better tomorrow..live in your present don't regret about your past nor think of your future..its very simple..once your present is fine then your future will also be fine..