s.costello

You're definitely not mentally disabled or crazy, you just have a little work to do on being comfortable in social situations. Maybe part of the problem is that you don't feel a great connection to these people, and that's why you don't feel like going to the effort of hanging out with them. Wanting friends is not evil at all. Good friendships brings mutual benefit because you both support and value one other, and you don't need a purpose to the relationship other than enjoying each other's company. I would suggest going to therapy though, it may help you to get to the bottom of this and provide you with ways to work through it.

I definitely agree that criticising people for bad decisions amongst friends helps you as a group to share your beliefs and standards with the people you're close to. One difficulty I find in this is making sure that you don't end up just bitching about people with no real purpose behind it. However, I think it does help to strengthen your friendships with good people and allows you to recognise one another's needs.