Absolutely not a dumb question. I have problems with isolation as well. There have been weeks for me when the most social interaction I have is when I text my family to tell them I'm safe in my apartment. What helps me to get out of it is to go to my university costume shop and work. More often than not, there is someone in the shop that I can chat with even if it is just to say, "Hi! How are you?"

I know this is easier said than done. Sometimes I have to throw myself out of bed just to do it, but it always makes me feel better.

So I would say, find something that you enjoy doing and try to find people that share the same interest. Also I always find that asking someone how they are doing opens up the conversation. It shows right off the bat that you have an interest in their lives and well being, and hopefully they will reciprocate that interest.