OMG DID I BREAK MY NOSE OR AM I OK?? SOMEONE HELP? 10PTS?

No, there is no way that by doing what you did, you could break your nose. The most common way people break their noses are to get hit hard in the face with something, or walk into something and hit their face... I honestly don't believe that you can break your nose by sticking your fingers in it and exhaling. And if you DID break your nose, you would most certainly know it. It would have been extremely swollen for at least a week, you would have had bruising under your eyes, you would have been in extreme pain, and your nose probably would have bled as well.