I don't really like being one too (though not to the point of hatred), but over the years, I've come to accept it. I might improve myself someday to talk to people more, but I don't think self-loathing is going to help me become less of a recluse.
Many of the famous people from the past were reclusive people, so don't go hating yourself. If you want to change, it is up to you, but I think that generally people are who they were meant to be.