Hi I am 19... 5'6 height n 180 pounds... my problem is that am having stretch marks aroung my butt and stomach area..!. I am not married... or pregnant... lik that... but is it because of my weight gain that the stomach stretches... I really don't want any stretch marks bfore marriage!. wht can I do for this!. does losing weight again increase the probability of stretch mark?

There are a number of products on the market that may help minimize the appearance of stretch marks. You can also visit a dermatologist for other ways to help even more if need be.
It is the weight gain, and partly heredity, that increase the likelihood of stretch marks... this is why they are often associated with pregnancy... quick weight gain. Losing weight won't cause more, but it doesn't cause them to go away either.