Originally Answered: teen girl problems wanna help(answer urs in return)?
Feeling good starts on the inside, true that! So, while I know you'll do the glam thing, and that's fine, do the other stuff, too, it'll last a lot longer and the confidence you'll project will be more than skin deep.
First, do something physical that you love to do: dance, play tennis, walk, run, do yoga, whatever turns you on, even if you have to push yourself to get started. Get your mom, sis or friends to do it with you, so you'll be accountable to someone else to show up. This will get your endorphins pumping, which increases the serotonin to your brain (the stuff that makes you happy). It will also keep you healthier, which will help you feel better about yourself.
Next, adjust what you are hearing: music, friends, family, tv, internet, books, etc. Are your songs sad ones or positive ones? Do the people around you complain a lot, put people down or do they talk of ideas, encourage each other, build each other up, are creative? Both the negative and positive of what you hear will influence your thoughts. And you have the choice of what you want to feed your brain with.
Speaking of food, there is such a thing as happy food and food that will bring you down. Make sure you are avoiding anything that you may be allergic to. Good foods include 'raw' foods, like walnuts, almonds, oatmeal, multi-grain bread, fruits, veggies. Avoid snacking on junk food. If you are hungry, drink a glass of water, or go for an apple.
Do the stuff that interests you. Do you make things? Write? Do plays? Do Improv? Garden? Build something? Have a full on movie night at home with friends. (Invite the ex? She might be a nice person in need of a real friend after moving around.)
Get involved in your own life, it's a pretty cool place with infinite possibilities. Breathe. Sing. Put on the music and dance.