No gain, a pain.

I eat, but I'm still skinny. I can't wear the clothes my friends wear--they're too big for me. What can I do to gain more weight?

Skinny girls have body issues, too. But if you complain about it, you're likely to get that rolled-eye look. To pack on extra pounds, you need to eat a little more--300 to 500 more calories a day, if you can. But you can't just chow on bon-bons and bacon double cheeseburgers. Instead, down lots of lean protein, like chicken and fish, says Martica Heaner, nutritionist and co-author of Cross-training for Dummies. Then, add a bunch of complex carbs, like brown rice, whole-wheat bread, veggies and lots of nuts. (Because different people digest food differently, eating tactics for gaining weight are very similar to those for losing it.) Another way to bulk up? Lift weights. Do upper- and lower-body exercises every other day. Oh, one more thing: You can always add some energy shakes to your diet. Yum.

I'm 16 and haven't gotten a period. I guess I should see a doctor, but I'm embarrassed.

Go to the doctor! And no need to be embarrassed. You wouldn't hesitate to ask your math teacher for help with the Pythagorean theorem. A math teacher's job is to answer numbers questions; a gynecologist's job is to answer health questions. Yes, it's a bit awkward to talk about puberty--at first. But it only feels funny for a split sec. The doc is there to listen to your concerns and make sure you're healthy. She'll probably tell you your late-blooming isn't a prob. True, most girls start their periods at 12 or 13, but you're probably maturing more slowly--especially if your mom and aunts did. But sometimes, says Dr. Adelaide Nardone, ob/gyn and medical advisor to the Vagisil Women's Health Center, girls don't menstruate due to hormonal issues, weight gain or loss, or other treatable reasons. So make that appointment as soon as possible.

I hate the shape of my boobs! They're not how boobs should look. I want them to be perfectly round. How can I change them?

There are so many kinds of boobs: perkies, droopies, grandes, teenies and lopsies. Hmmm. But there isn't really a category for perfectly round. Why? Because they don't exist in nature! Like eyes, feet, hips and booties, boobs are different on every female, Dr. Nardone explains. Yours are unique--totally you. In order to have "perfectly round," you'd have to have plastic surgery. And is that what you really want? Fake breasts are expensive--five grand and up. And when you hug them, they're like hard, gel-filled balloons. Plus, the surgery hurts! (Chop, chop--yikes!) Another point: Not many good, reliable surgeons will even consider doing boob jobs on girls under 18. So give your boobs a break--they're still getting used to this puberty thing. For more shape, try a flattering bra with molded cups, like those by Le Mystere. And don't be such a boob to your boobs.