Curiosity may have killed a few cats, but without it dullness gnaws away slowly at the life of every other cat that's ever existed.
Don't be shy. Be curious. Stay curious.
Participate. Life is lived through its current experiences, not its memories; for memories will fade until they appear to have never existed at all.
Don't just live and let live, live and help live. That is to say, when you learn, teach; and when you have, give.