I feel ya. I'm glad you're already seeking help for the depression. Stay with it!
Your suggestions for hobbies are actually spot-on - the best hobbies for depression are ones that are either productive/creative or require a lot of physical energy. TV, video games, computer, etc., none of those fit the bill so try to limit your time there.
Finding activities around people can be tricky - seems we're all kept to ourselves a lot. Is there a local gym that has an informal basketball league, etc.? If you golf on a different day or time, do you find younger players? If you're into learning new things or local history, look for a nearby museum, library, or college where you can take a class or two on a topic you like - odds are there'll be others interested in the same thing, and that's an immediate ice-breaker.
For your time alone, look for productive hobbies - yes, like writing or drawing, but also think about crafts. I'm a "yarnsmith" myself, and that's becoming slowly more popular with young men too. Simple carpentry like building crates or chairs? Paracord accessories? Upcycled junk (Google it, the results are inspiring!)? The upside to crafts, as opposed to something like writing (although I do that too), is that not only do you have a growing pile of accomplishment, as you improve at it you may have more opportunity for selling your work at fairs and meeting more people in the process. Still, even if that never happens, there's something therapeutic both in the making of things and the viewing of a finished product, the work of your own hands.
Best of luck to you!