This has been a huge issue in my life during the past few years. Before then, I lived at home with my parents and 2 sisters, went to school every day with my friends, and had a very active social life.
Now, I live alone with my INTJ husband (he's great, but not the same as being surrounded by friends and family all the time) and we both work full time. At work, I'm by myself all day, pulling kids out of class to work with them for 30 minutes at a time trying to cram as much speech therapy into that time as possible (usually fighting with schedules, against the clock, and often dealing with behavior issues). I do love being with kids, but I just don't feel like it's any substitute for the socialization I need. Before, I worked as a waitress where I was constantly chatting with co-workers and customers. That was much better for me. Now, I have my own room, and often go for days at a time without really interacting with another adult at work. Or when I do, I'm running a meeting with a strict agenda or talking about special ed. law and procedures (NOT FUN!). So I come home from work, make dinner, eat it with my husband who's trying to decompress after work (that looks a lot less like active conversation for him than it does for me). I try to make plans with friends, but we're all adults with busy lives so it just doesn't happen very often.
Anyone else have a hard time adjusting to the isolation of adult life? I just feel like all that alone time really takes a toll on me. I become kind of shut down, and seriously lack motivation. This kills me because I feel like my natural state is enthusiastic, motivated, and engaged.