I once received this fantastic advice/strategy from our school counsellor, which has helped me teach my students and my own children about putting their problems into perspective. I have even used it on myself a number of times too.
Step 1: Rate your mood on a scale of 1-10 (with one being the most awful)
Step 2: Decide- is your problem personal or general. i.e. Are you the only person to have this problem or do you think it is a general problem that other kids of your age face too?
Step 3: Decide – is your problem catastrophic (disasters, death etc) or normal.
Step 4: What advice would you give if this same thing was happening to a friend of yours?
Step 5: Rate your mood again.
Sometimes, putting our problems into perspective helps us deal with them rationally or simply get over them and move on.