Am i Underweight....?

I mean you sound a little underweight, but if you're working on changing the fact that you're bulimic, you're doing perfect. If you're wanting to get to a healthy weight, don't eat fatty stuff like donuts and chips all day. If you gain too much weight and get chubby, you'll probably start purging again, so just make sure to eat healthy things. Also, drink lots of water. Being that skinny, you can definitely become dehydrated and have a lot of diarrhea if you don't eat right. Good luck though :)