i think surgery is an expensive way to make the most of yourself... and you are so young to be thinking about botox and fillers etc. that's where a lot of the 'celebs' go wrong; megan fox, jordan, TOWIE, etc. they mess about with their face and it looks wind-tunnel age-less (which actually does the opposite and ages them). unless you were really fat and have a load of excess skin (im thinking fat bastard and his vagina neck, kinda thing) then im sure you dont need anything done!
in terms of boob jobs... i used to be really flat-chested when i was at school, so i get how it can knock your confidence. but your body still has time to change, so dont be too hasty in getting a boob job. plus, they rarely/never look or feel natural.
embrace your flaws, look at people like kate moss; shes flat-chested, got a weird face... but totally beautiful in her own unique way
in contrast to the essex clones... id choose her look over theirs anyday!
sorry if this is a seems bit preachy.. just wanted to put my views across. ultimately, its 100% your life and your money, so spend it however you want and in whatever way makes you happy