The two books I recently read "The Disappearance of the Universe" and "Your Imortal Reality: Breaking the Cycle of Life and Death" actually give a very interesting perspective on suicide. I don't know the exact number, but somewhere in there they give the stats of the number of suicides in North America (or maybe it's the world) is actually higher than the number of people who die from war, violent crime, murder etc. The book talks about how it's kind of a silent part of society that nobody wants to talk about unless ofcourse it's a suicide involving a murder of someone else or something that will sell ratings.
In either case, the books give a good perspective on why so many people choose to go that route and how it doesn't really solve the problem they are trying to solve. According to the thinking of the books, the people seeking suicide are actually seeking an escape from this reality (via enlightenment), but just because you kill your body doesn't mean you automatically become enlightened. What the books say happens is you just re-incarnate again with the same problems on and on until you face the problem itself and move past it.
It might sound weird but the energy behind wanting to commit suicide is the same energy as wanting to become enlightened, just applied in a different direction. It stems from the deep feeling there is something deeply wrong with oneself and this world.
I'd recommend taking a look at these two books to see if you find answers in there first, because if the book are right, nothing will be solved by suicide. Trying to escape living another day in this world through suicide could send your consciousness on another journey of birth to whatever age you're at right now with all the pain associated with it and you'll be in the same spot as you are now once again.
The pain involved with suicide and the pain you'd give your family is one thing, but if you do come back again and again over and over again without solving this problem, you could be stuck in an endless loop of birth/pain/suicide until you choose to move past it. The fact that you're on these forums asking questions seems to me like perhaps this is the lifetime you've chosen to take a different path with.
Something to think about.