I have suffered some minor anxiety and spent a solid amount of time in my life with all sorts of people to have a somewhat insightful opinion about loneliness. Its all "FEAR" fear of being judged, fear of rejection, most of all fear of not "fitting in" . All you need to do is see the world for the things you adore over the things that you fear. It's better you put your mind in a more positive state, instead of thinking about the worst possible outcome. Be yourself, let go of fear