My brackets keep falling off and I feel terrible?

So I've had braces for like a year now. There's at least one or two that fall off every month. And it feels horrible!! I'm going through underbite treatmeant and everything's looking great. But I feel like I bug my dentist too much with my brackets falling off. I feel one loose, but it's like not unstuck. What does this mean? And I have one that fell off because I was eating, and my top teeth knocked it off because of my underbite :( I feel terrible about it and I don't think it's normal for them to be falling off too much?! What should I do?! It's like my own teeth knock them off because of the underbite.