I think you're right that for you to go to a class or anything interest related JUST to meet someone is a bad idea. But at the same time, i think its okay for you to try a class or gathering to see if you like something if a good idea. Otherwise, many times you don't know if you would be interested or not.

I know this is coming from someone who has somebody in their life, but meeting someone should be a bonus in that environment, not the goal. When i was single, I saw all these single volunteer groups and I didn't bother with it because, not to be mean, but I didn't really care. I felt like it would be hypocritical to join up to meet someone, and not really care about the work I was doing. Also, my therapist at the time suggested that I join toastmaster to meet people and at the same time, learn how to speak publicly. I turned that idea down because I really didn't care to learn and although I did want to meet people, I could care less about the subject.