Is it the age or it's just me?

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I left the party last night. I thought it was a very well organized event with awesome design of made shift bars. Everybody was dressed at their best too and each one was glowing. The venue had different atmospheres to choose from. There was a salsa bar with nice live havana music, a disco lounge with more pop sounding canned music, a huge dancing space for the more seasoned guests etc... yet I found myself not really enjoying the night. I was not sad or lonely, I just felt tired and thought it was not my cup of tea. I just went home without telling anyone. I just surfed the internet for a while, read for the remaining hours then finally hit the sack.I went to sleep at almost four in the morning still though coz it would be Sunday when I would wake up in the morning. Now I am just in bed the whole day. I ate my late breakfast then went back to sleep. I woke up after about two hours to smoke, read and surf the internet. I feel really great being by myself and not even chatting with anyone on the net. I am totally not bothered at all that I am just in my flat the whole time. I then realized that I have become more of a loner these days. Am I at a crossroads of my life wherein something in me is changing yet somehow I don't quite understand? Or is it just the age at which I might not be enjoying certain activities that I did when I was in my teens to my early twenties? I feel the childish feeling in my system yet I also feel so old in the way I act and think at times. I sometimes doubt if I am normal because I don't even feel the need to connect with my family or friends at the moment too as they are from me anyway. I gained some friends here but not as close as the ones I have at home yet. I don't know, I feel calm yet I kind of feel I should find an answer to this change in me. too