How can i fix my pendrive?

I was using my pendrive and i put it in my bag, and later i said i should store some information on it but now it can't see or read from my computer and i thought i have lost some of my programmes but when i send it to my friends computer it was the same and i want to know if there is a problem with my pendrive and how can i fix it? MY email address is wolf54@gmail.com