I think talking about your issues here is in itself a good thing. Not because of the feedback which might make you feel worse at times, but because you crystallize the issue in your mind as you write it in precise words. Just don't let anyone drag you down, your history and personality aren't dark.

You said you have acquaintances, so why do you feel lonely then? Do you go out with them? and share activities with them?

Being alone is not a bad thing in itself, but it depends on how you see it. For me, I think most of my identity and character have been developed during my alone time, especially at very dark alone times. Even though I can live alone forever (I've done this for the last 14 years), hypothetically speaking, I don't want to, and this "I don't want to" causing me anguish and pain at the moment. On the other hand, many people choose to be alone and they are happy with it.