opportunism

A friend of mine, Brian Clarkston, told me tonight that he believes me to be an opportunist.
The Merriam-Webster Online Dictionary defines opportunism as, "the art, policy, or practice of taking advantage of opportunities or circumstances often with little regard for principles or consequences."
This definition makes opportunism sound somewhat negative. However, in my case, it holds less severe connotations. I do try to take advantage of every opportunity, in the sense that I never say no. I try to experience whatever I can and take chances, even when I am afraid or nervous. I generally consider the consequences and keep good principle in mind, but they usually do not stop me.
The guide I use to my opportunism is simply, others. I never take an opportunity that will severely, negatively affect other people. I do not want to hurt anyone else in any way, ever.