I believe I'm the same way. I've tried to be intimate or close but it takes me a very long time and it's pretty hard with the sensory issues (Aspie here). I think I know why people like us might feel this way though. We're probably used to hiding as not to be seen, judged, and ridiculed and eventually that grows into completely avoiding social or romantic attachments. Also, might have something to do with your relationship with your mother if you're a boy and your relationship with your father if you're a girl. Well.. a lot of factors, if you where raped at a young age. If you where abused as a child, etc.