I tend to agree with this. If you won't leave your comfort zone, that's nobody elses responsibility to make you. In order for you to experience new things and make new friends, you are going to have to jump in at the deep end, or you will simply be left behind.(Original post by Infraspecies)
I'm not surprised you think you'll be alone and friendless; you seem intent on it.
If you want not to socialise, or drink and get involved, then yes. You will be a hermit. Please don't try to fob the responsibility for that onto anyone else, though. It's down to you, you could choose to be friendlier.
If you lack confidence, start faking your confidence, and eventually it will come naturally.
How are you feeling?