Risk worth of taking

Peoples say that we should learn to trust on others more often,
but how can you learn to trust and depend on others in this kind of world?
Even your own shadow leaves you when you are in darkness,
so how can you trust that the peoples on who you depend on will be there
in darkness for you, helping you up again in light ?  Life is risky, but i still belive
that its totally worth of it. It just shows up who are the real friends...