Almost everyone is conditioned to think in two ways, either Positively or Negatively. These two qualities are learnt growing up and firmly engrained eventually into us over time. It affects the way look at every single thing in life consciously and more importantly subconsciously.
The Positive guy, the one who keeps looking for the good in all situations, even in very negative conditions. He keeps looking for that silver lining. For such ones, they see all situations as an opportunity to learn, to take a positive advantage or make the best out of any circumstance they find themselves.
The Negative guy, on the other hand, always chooses to see the bad in every situation. Even when all the lights flash green all the way, he believes its a trap. Everybody he believes, is out to get him. Paranoid and suspicious of every single situation.
The two sets of people mentioned above, all learnt to think that way and eventually made it a habit. It became a standard operating procedure for how they see and deal with what life throws at them.
My take, Its better to develop and maintain a Positive Attitude. Turn it into a habit. Seeing the bad in everything only doubles the burden, its already bad anyway. Negativity is all around us, slaps you in the face unexpectedly even without you asking or looking for it.
Positivity however is much harder to come by. Sometimes you have to diligently search for it. So start today to make it a habit to be positive and look for the good in every situation you face, whether its good or bad. It doesn't cost a thing and you can start taking baby steps towards that direction. Its helped me and i believe it can work for you too.