The term 'make you or break you' is used a little too freely, but it's how you actually react, absorb, and deal with these difficult situations that helps shape and build your character and you as a person.
How do you deal with it? Maybe you get yourself all alone and cry in desperation, maybe you get shitfaced drunk and forget about it for a few hours, maybe you get angry and slam stuff around and yell, or maybe you're wired a little like me - and just laugh and shake your head. My wife thinks I am some kind of 'he went off the deep end' maniacal laughing dumbass. She wonders how I don't get all pissed off and freak out at everything like she does. That's easy. It's all about approach, experience, and reaction.
Approach. Are you already pissed off and this situation just adds to it? Just recognize the issue, laugh or breath for a quick second, and then move forward a resolution. Some things are out of our control and we just have to deal with it, but it all starts with how you are going to approach each situation at hand.
Experience. Sometimes the things that happen to us we are already expecting. We have been through it ourselves or have helped someone close to us get through a similar situation. Maybe your house is getting foreclosed on. This news and situation is easier to break down and deal with emotionally if you have already been homeless or shitty living situations. But remember one thing - you got through those shitty living situations previously. Take your experience, add it to your new wisdom gained by living life, and dust yourself off and do it again!
It's a action/reaction type of thing. Something bad happens = action. You loose your cool = reaction. It really is that easy. Mentally preparing yourself for the bad things that can happen without spending all of your life dwelling and afraid of that particular situation is a key to being able to move forward, deal with the situation, cope, and take care of what needs to be taken care of.
Keep your heads up my friends. Shit can always get worse - don't think for a second that it can't. At the same time - shit can ALWAYS get better as well.