You're still making yourself throw up whether you need to use your fingers or not...I used to think it wasn't a serious problem because I could just lean over and purge whenever I wanted to after eating, it wasn't like I had to force it with fingers, etc., but you do damage all the same to your teeth, esphogaus, throat, and it is a conscious decision whether you throw up or not, it wasn't something that just happened in my case, I did have to get up and go to the bathroom and decide I was going to purge and then I would...though in my case, I was more anorexic or ED-NOS as I didn't really binge before purging and restricted a lot...
Many bulimics are normal weight for their height or even overweight.
Please do get help. It's not normal to be throwing up your food that often.