What causes me to get really emotional?

I get really emotional for very little reason. It can be just watching a television commercial or watching a movie trailer. I feel embarred about it since guys are not supposed to be this emotional. I recently stood up at a wedding and tried my hardest NOT to shed a tear. Smiled the entire time as the other guys were balling. The bridesmaids made it a point to let it be known that crying was a turn on. I was saddened about this since it backfired after trying to impress a bridesmaid. Well, now it's just getting worse each day... I can be watching a TV ad with a touching story and start feeling a sudden rush of gut sadness, to the point I start sobbing...What is that? Why? DO I need medical help?