Loneliness is a kind of phycological barrier a person puts to themselves. If they wish to break that and come out, they can do it but they isolate themselves from community interactions initially and gradually it becomes loneliness. A well detailed article.
Yes, as I've mentioned in a couple of replies, we are often lonely just because we are too scared to go out of our comfort zone and take action to find and meet people who we can go along with well. Thank you!