I also struggle with criticism. For me, I take it very personal. That's where my problems start. For the most part, when someone is being critical of my work, I'm learning to accept that it's not me personally they are offering criticism to but to a process or project. From the person giving criticism, they are simply interested in improving that process or project. I constantly have to remind my self of that.

I know that my example is in a work context but the same can still be applied outside of work. Unfortunately for those of us that have issue with criticism, change is always happening. It's how we handle that change that defines us.