Dealing with sadness/feeling depressed.

Hey guys, i'm really interested - how do you deal with sadness? Especially after reading some really tragic or dramatic manga/stories. Sometimes i feel like I'm suffocated by feelings and thoughts over manga/book, etc. I waste so many emotions and time on living through all of this fictional stuff, on constantly mulling over the most sad momentsagain and again in my head. I understand that it's just a story, that characters are fictional and all of this is not real, and I can't change anything of it, it's just the way author tells her story, but it doesn't help me at all. I realize that partly it's because my real life is poor on interesting events, emotions and positive experiences, that's why I focus on fictional stuff that seriously. Yeah, there are friends I meet from time to time but all of them have their own life and their own problems *and they are not really into manga and stuff* >.<"
Sometimes when i see the update of the manga that I know is sad and dramatic I want to avoid it even, but I know it's stupid because at the same time I really WANT to read it! So I'm kind of lost here T__T
So how to not take everything so closely to heart? Maybe some of you could share their "tips and tricks" on accepting what is happening and moving on.
Thank you!
*and pardon my poor English, it's not my native language ^^"