Seize the noun, opportunity, if you're talking about circumstances that allow you do to something you'd like to do. Wouldn't you love to have the opportunity to meet your favorite musician?
When the situation is right for you to do something you're interested in doing, you have the opportunity to do it. The word comes from the Latin phrase, ob portum veniens "coming toward a port" which refers to a favorable wind blowing ships into the harbor. Think of an opportunity as something a good wind blew your way.