I really wanna change :/ i wanna be prettier.. im always trying to change myself to please others?

i really hate how i look and i have no self confidence speshally when i look on tv and in magazenes at all the really pretty girls i cant not never were nail varnish otehr wise my hands look bare and i cant go out without foundation on iv orderd some hair extentions and i always wear bangles but somehow i still dont feel up to my bf's standards -.- even when i get ready and then go oytrside my hair goes flat and i look like an idiot! i just want to be happy with myself and im constently trying to diet which never works im 5.6 and 9stone size 10 or sometimes 8 but i see all these skinny girls and they all look so pretty i just want to fit into taht but i cant do anything else to change myself :'(