you need some self confidence, chickie! you have potential, you just need to learn to work with what youve been given! here are some things i think that would help your appearance:
you have nice skin, just need to clear up the blemishes a little: clean and clear deep action cream cleanser and (only if you have blackheads, cant tell if you do) the clean and clear blackhead eraser...they dont dry your skin out either!
get some contacts, the glasses hide your pretty eyes. add some mascara to make your eyes pop!
get in a 10 minute workout every morning to help burn calories throughtout the day and to release "feelgood" endorphines. or go for an early morning jog or brisk walk. that or a nice bike ride.
try some new hairstyles, ones that compliment you. you could even add some earrings!!
find a new style that makes you feel beautiful. play with pinks and blues and your fave color.
when you finally find the beauty in yourself, im sure others will see it too. dont ever think of yourself as worthless..thats just asking for that feeling to eat at yourself and its not healthy.
maybe treat yourself to a makeover at a salon! or even ask them for some advice.im sure someone will help you.!
give yourself some character!!!
hope i could help, youll be fine!!! good luck