Emotions..... Please help?

This past year, my emotions have been getting the better of me. This really hasn't happened before, I swear.. But I've started crying a lot. A lot more than I ever have before. I almost always get teary when I'm angry which sucks if I'm in an arguement because I'll start crying and it's embarrassing. Plus if I'm crying, I can't get my point across.... Sometimes I even cry for no reason! Well, I mean there's always a reason. I'm just saying sometimes I cry for just thinking about things. Stuff that makes me sad or stresses me out. Life in general! I don't know. It's just not normal for me because I'm usually a lot better at holding in my feelings. I don't know what to do! Does anyone have any sort of explanation for this? And before you say anything, I am 16 and I have already hit puberty and growth spurts and all that. Plus, I am not pregnant or anything like that so I shouldn't be on any emotional rollercoaster or anything.... ahh.. just please help. I hate crying...