Hey!!this question is for girls..PLEASE HELP?

I am girl aged 17...gonna turn 18 in 2 weeks...I wud like to ask..wat can i do to get a perfect figure.!i used to be kind of a little healthy looking..Not fat!!!...and then after a while i started becoming thin..guess cz i never ate well....so now i kinda look malnourished...my height is around 5'4''....I wanna grow tall too....and what can i do about the scars that occured due to reduction??