>>1
After the age of 7, I pretty much stopped crying. Very bad though, in my case. I was repressing a lot of sorrow, as well as most of my anger. I got some anger management, and improved my life. I don't really have a reason to cry most of the time, but when I do I have no problems doing it (such as when my girlfriend got into a accident and it appeared to be bad). Chopping onions doesn't make me cry, by the way.

If you feel you're bottling up any emotions, then yeah, you should fucking worry. You might just have tear-ducts that are wired that way, though.