My life is losing all of its substance. How do I start living?

I work full-time in an office for a large portion of the day and usually get home at 7 or 8 at night before having to go to bed at 10 or 11, leaving me with little (2–3 hrs) free time. I’m starting to get depressed, bored, and lonely from sitting in front of a computer all day to sitting in front of a TV/computer all night until I go to sleep.

How can I start living my life? As much as I’d like to just quit my job and buy a plane ticket to Europe and stop thinking about the future, that’s just not realistic right now. I’m looking for small ways to start improving my quality of life and want to start feeling like I’m actually living. I want to start meeting new people, helping more people, becoming more active, having more adventures, etc.

I’m looking at weekend volunteer opportunities, but that’s about all I can think of. How can I start feeling like I’m living life to the fullest?