If you're happy generally your relationship status doesn't matter. Everyone has good & bad times regardless of their status.
Single means different things to different people.
Some people define it as not being married.
Others define it as not being an "exclusive relationship".
While some folks define it as not dating period!
(Not even casually).
When I was single I had a blast going out to nightclubs, parties, BBQs, and (casually dating). I couldn't wait for Friday's "happy hours" after work. I also had single friends to hang out with.