Actually, there are very large stretch marks all over my butt and thighs and it !

Actually, there are very large stretch marks all over my butt and thighs and it pains a lot when i sit.?

it gives me a very sharp pain when i sit for 1-2 hours at one place and my butt starts sweatinng and it becomes a little warm too.
one thing more when i have masturbation sometimes pain on my stretch marks increases. can you please tell me what is this due to?

Maybe it's simply due to being inactive. Move around more, and get some exercise; go on frequent walks, maybe think about joining a gym. Also, try wearing different clothing, like breezy shorts instead of tight pants. There are also some lotions which are suppose to reduce the appearance of strechmarks, if you want to use them.

There is the chance that you have an infection. It's highly unlikely from what you've said, but just to be safe, shower frequently anyway. (ex. once in the morning, and a quick rinse later at night before going to bed). If nothing else, it promotes good hygiene, and feels really good.

All of these things should help with how you look and feel. Try this regimen for a week or two.

If you feel like things simply aren't getting any better (or are getting worse, as the situation may warrent), then make an appointment to see your doctor, since it may be something serious.