The good thing about the guitar is that with a few chords you can be playing and singing some of the most popular songs about. Classes are okay but if you can find a local folk club you will find lots of like minded people who will give you ideas and help you along the way.Those in the club should give you the encouragement you need and soon you will be surprised by what you can do.It may start out for your own enjoyment but I bet you soon will be be happy to share your playing/songs with others.