Admit that you need a change in your body. Women will always compare themselves to one another, especially if they have low self-esteem to begin with. There is nothing wrong with wanting to lose some weight, but becoming obsessed with it is not helpful. What you want to do is join a sport, or just work out. If you want to join a sport, go to a few camps. It's an easy way to get in shape and meet new people. If you want to work out at home, buy a couple work out DVDs/tapes and actually do them. You can even buy a dumbbell set and a strength train if that sounds like a better idea. Cardio is generally the best type of work out to burn fat. Whether you do it at a gym or at home, do 30-45 minutes of cardio a day twice a week and strength train twice a week. Always remember to give yourself one day in between work-outs so that your muscles can rebuild themselves.
Go to sleep! Your body needs time to relax and recharge after a harsh day, so you need at least 7 hours of sleep. Aim for 10 hours if you can, but 8 or 9 hours is fine.
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Do not get fake nails because it will wreck your natural nails. Keep your natural nails trimmed and filed, and always keep your cuticles pushed back. Moisturize your hands frequently. If you have ridges, buy a nail buffer and keep them buffed. You may choose to polish your nails, but avoid any gaudy colors unless you want to look as if you are exaggerating yourself
Let your hair grow out during the summer. After school/College gets out, get your hair trimmed and leave it that way. During the summer, experiment with different shampoos till you find the perfect one. Go to your local salon and ask what shampoo they would recommend for your hair.
Spend some time working on your wardrobe. You want to get the basics, like a nice pair of dark wash jeans and a nice white t-shirt. Depending on your age, you might want to splurge on investment items, like a nice suit or a little black dress (think Audrey Hepburn a la Breakfast at Tiffany's) and some nice pearls. If you're a teen, just find jeans and a shirt and shop around for what you like. Look around for things that looks great on you - as a teenager, you can experiment.
Get your eyebrows done professionally if they are difficult to manage, then pluck the stray ones yourself. If you don't want to spend a lot of money, just find your brow bone and follow that. You can find YouTube videos on how to pluck your eyebrows