By itself, tofu is like wet foam rubber, but you'd no more eat it by itself and expect fine dining than you would stare at a blank canvas and expect to see fine art.
That old saying about opportunity only knocking once is as archaic as the flat-earth theory and as patently untrue. Opportunity knocks all the time - and it rings your doorbell, calls you up, and sends you e-mails.
Follow the tugs in your heart. I think that everybody gets these gentle urges and should listen to them. Even if they sound absolutely insane, they may be worth going for.
Every person you see has stories, and every person you see has a few that would break your heart. We deserve each other's respect simply because we've survived all we have and kept going anyway.