Is it okay to lose weight in a short time? would there be flabby/flappy skin where i lost the weight?

i've gained a lot of weight over the course of a year. and i've started to develop stretch marks on the side of my arms... i'm currently 190 and i wanna get down to around 160... if i were to lose weight over the summer which i am determined to, would i have those flappy/flabby skin that adam sandler had in click? like would there be excess skin in those areas where i lost fat? i only have stretch marks on my arms, but i developed a belly... would i have excess skin that would flap around?
Answer:
you will not like adam but you will dont loose it in such a short time wait till spring 2009 but start now and do it with exercise ,and rememmer to hidratate your skin ,and use a lotion for stretch marks or have veabing laser treatment or microthermage or both or even the 3 of them if you do it the way you're planing to not only you're gonna get flabby/flappy skin but you can actually gain all the weight back and have problems with your health

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