How to keep positive and optimism thought when faced with bad circumstances?

bad circumstances sometimes mean new experience, so actually I have to be positve towards this bad situation because either I'll defeat it and it will make me so positive or I'll learn a lot from it, so when i face the same situation again I will be able to deal with it so easiy because I have a previous experience with it, so it is a reason to stay positibe and optimistic.

Always look at the big picture and remind yourself that you're doing better than a lot of people who are less unfortunate, Know that there is always a space for you to grow and develop and experience new things, no matter what you lose it doesn't matter, what matters is how you think about yourself and that should be a very happy and colorful thought, a safe place if you may say... You've been though worse and got through it and got right back on your feet. 

One of my favorite quotes is " it's a bad day not a bad life " Stay positive :)