From one girl to another, how the hell do you walk in heels without your feet hurting? Is there some kind of "heel training" I don't know about?
The specific pair of heels that you are wearing have to be comfortable. Do they fit right? Do they pinch your feet at all? Does your heel rub against the back? Do they support your arch? Once you've determined that the shoe you are wearing is definitely comfortable, then you have to move onto walking.
I'm going to be honest, walking in heels just comes with practice. All of my shoes, including my more sporty ones or boots, have at least a 2 inch heel. This has less to do with me and more to do with my mom's spergery about how I must always wear shoes with heels, but I digress. If you have a good pair of heels, just practice walking around in your room. Don't wear heels that have very thin "heel" (eg. pencil heel). Ditch the stilettos and try a good wedge heel, or other design that has a stable and wide heel.
Since I have worn heels every day since I was a tween, it just feels natural to me to walk in them. And yet, if I put on a pair of 6 inch stilettos, I find myself struggling to walk in that kind of shoe. Mainly, I find that my calf muscles aren't developed enough to accommodate the awkward angle that the shoe is forcing me to walk at. So definitely begin with a smaller, wider heel. Overtime you'll find it easier and more natural as your legs and balance accommodate to walking on the incline.
If you do have to wear a more difficult kind of heel for a formal event, then use the tiptoe trick. As in, put on the shoe, and walk around like you're on your tiptoes. I know it's uncomfortable but that's basically the position the shoe is forcing you into anyways. The higher the heel, the more weight you need to focus on your toes, and away from your heels. For some heels, you won't completely be on your tiptoes, so adjust accordingly. But basically the rule of thumb is that when you're in heels, your weight needs to be focused on the front of your feet, not the back of your feet. The higher the heel, the more weight you shift to your toes. In flat shoes, you'll notice that most of your weight is either in your heel or at least evenly distributed through your foot.