Need help with stomach area!! HeLp Me!!!!!

[NewYorkzFinest89]

heyy how r u... i new to this site.. i joined because i wanted to learn more about weightloss because i actually wanna lose weight!.... i am 18 years old 6.1 and im about 275 lbs... most of the largeness is in stomach! i wanna lose weight but im scared of haveing exess skin hanging ... stomach is not hard at all... its like bouncey and it hangs a little bit im scared that if i lose weight im going to have lil wrinkely skin hanging at the bottum of stomach. i want it to be nice and tight as thought it was never large!! Will cardio and weight training give me these results?. i would like to lose about 90 pounds and have a 6 pac by like mid winter.... is that impossible?? thing is that if when i lost weight besides from health, it dont look good then it totaly defetes the purpose! one more thing... i here alot that once a streach mark forms that theres no way to tighten ur stomach back up because that has to do with the skin and not the muscle.. i really need help... plzzzz help me i need this weight OFF!!! n for it to look good off instead of looking a hanging sloppy mess!!!
PS:if u need pics to see what im talking about, i dont no how to post them on here so ill send it through an email.... please help me, all that can! thank you!!!