Do I have an opinion?

There was a time when everything I needed to know was in a text book!  The answers were easy to find, and translate into my own words.  Now it's all about my opinion.  Do I have an opinion and do you really care about my opinion?  What if I have no opinion on that particular subject?  Does it mean anything?  May be my opinion will not make a change.  Maybe my opinion is not particularly witty or intelligent.  Maybe my opinion is as simple as "because it was the right thing to do".