Great points from downwardsfromzero and kerelsk.
Good to stay busy. Yeah, getting yourself out more, doing things that you might enjoy, helps/ends up putting you in situations with people you might have otherwise never met, then it goes from there. Typically you're glad you had went out and did whatever it is you did. I know there's so many times that I've been like "Absolutely not, don't feel like it, tired, people, etc", the list goes on as far as reasons go.
I go out and do things, typically alone, or with the significant other. She has two awesome children [1 year old & 2 year old], so that makes most situations interesting and always keeps you on your toes. The short time that I've been around babies and their transitions into the realm of 'being a 1+ year old child', watching them and interacting teaches you more about human beings and the daily people you encounter than anything else I've found.
Hiking a state park, or hiking anywhere out in the forests [if you have those near by] has always been something that's helped me quite a bit. Like spending hours away from trails out in the woods, it seems to reset things for me. Then again it fits me and its something that's always worked very well and has carried over into my life.
With that said, I know what you mean DisEmboDied. I went through a couple small periods like that, though my past addictions didn't help things in the slightest hah. Kerelsk is right though - 'the eyes to see it', so true, life is beautiful, its a thrill, its depressing at times, gruesome, etc; it's all these things, but things/the world as it sits [nature] - it's impossibly rich and complex, though it takes a substantial amount of effort on the part of the individual to get out and be immersed in order to experience it firsthand and feel it imo.