As a person that has lost 100+lbs and have major stretch marks to prove it, I will say I have seen massive skin improvement over time and with a serious focus on adding muscle tone.
I will never have the body of a non-formerly obese person in their 20s, that is life. Even skinny 20 year olds have cellulite.
But I do look damn good in a bikini.
And to ease your dating worries...no man, at ANY weight I have been between 120 and 240 ever ever ever said anything rude about my body. Men like to see boobs, they dont really care if they sag a little...they like real girls not porn stars with fake parts.