Verbalizing that you think something is wrong with you belittles your previous message that you are confident. Whatever issue it is that you aren't confident about should be worked on. Should you decide that you don't want to work on these issues, and instead embrace being alone, emotionally, you need to find things that can occupy your time and keep you from going crazy in your own space. The gym, reading, video games, watching sports, and friends come to mind. Sexually, you can have casual hook ups, find hookers, which recently I've heard rave reviews of, or enjoy masturbation.
I'm thinking 'bout how people fall in love in mysterious ways, Maybe it's all part of a plan, Well, I'll just keep on making the same mistakes, Hoping that you'll understand--Ed Sheeran