Will I ever be able to wear a bikini?

I'm 18 and I have been over weight for a big portion of my life...I weight 240 pounds and I am going under to get bariatric lap band surgery. If I get down to around 155-170 depending on where I feel most comfterable I would like to wear a bikini for the first time in my life...I have quite a few streach marks but they aren't super visable in fact with some coco butter I will be able to lighten them more plus the weight loss will shrink them...but I'm so worried about excess skin stopping this from happening. I also want everyone to know this is not for cosmetic reasons I have a lot of family history and some of my own health problems due to weight but it would be nice to go back and show all of my highschool bullies how amazing I look, is there anything I can do to help this not happen? Is it inevitable? will any amount of toning work outs help?