The general consensus is that self injury is emotionally unhealthy, but I don't understand how. Are there reasons besides religious ones and that it is socially unacceptable?

I was wondering what exactly makes us laugh? And why is it so hard to stop ourselves from laughing?

I am a college freshman and I think I'm on my way to becoming bulimic. Since my junior year of high school, I have periodically binged and tried to purge, but I was never really successful and it was never frequent. My senior year I made myself semi-successfully throw up for the first time, but it was gross and scary and made my throat bleed and I stopped. However, since I've gotten to school this year, I feel like things have gotten out of control. I started out eating healthfully and losing weight, because I am about 15 pounds overweight and need to make a lower weight class for my sport. (I am at a high level and compete internationally.) I'm also terrified of the "freshman fifteen" since I've always been chubby at the least. I couldn't keep up my healthy eating and snapped, and now I binge all the time and for the past few weeks have been throwing up. I think I could stop but I'm not sure. Am I bulimic or just going through typical freshman food phase?

Thanks for any advice.