It's something hard to write this since it's been a while since I wrote in english, but whatever.
I can relate to you. Being 25 and looking at couples, groups of friends having fun, and happy families running around makes me feel uneasy and insecure of myself as well... But recently I started to notice a slight change of mind. If I am alone, I start to feel awfull when I'm exposed to people, but if I am with people I tend to wish I were alone. I desire a family? Not really? I desire a girlfriend? Maybe not.
So, the thing is... Maybe you need to assert what are your personal needs. Company and joyfull moments are easy to obtain if you are spiritually humble enough.