Nothing wrong with you, however if it is getting you down that you are doing these things alone, and you want to be more involved then there are ways to incorporate yourself into the social situations.

But, if your happy in what you are doing then keep doing it :)

I am a 3rd year PhD student and I am not one to go out to the bar at all! Lol so you do more than me already. The bar scene for me is not something I enjoy. Even as an undergrad, I never went to the social evenings etc. People just get drunk and act stupid. Plus I am 29 and married, so have other things I'd rather do.

However I have other interests and hobbies to keep me sane while doing my PhD. I am very active & go to the gym, snowboarding, hiking, etc. However the PhD was always on my mind, 24/7 thinking about my research. It was really getting to me. Thinking about it constantly was stressful. So I tried learning something new. My husband convinced me lol

I started Brazilian jiujitsu! Never did ANY other martial art ever in my life. So it was scary, but I am so glad I did it. The people are so friendly, it occupies your mind and its a great stress reliever. Plus you can interact without discussing your PhD all the time. Its a mini break from it. Learning something new seemed to give me a boost. I can think more clearly and I am not as stressed.

So maybe interacting with a new crowd of people might work??