Look into “avoidant attachment styles”. (And, really, attachment styles in general.)

Perhaps even look into avoidant personality disorder and/or schizoid personality disorder. (I’m not diagnosing you or anything, but what you’re talking about is something I’ve heard frequently in relation to schizoid personality disorder. I’m not quite as familiar with avoidant personality disorder, but it’s sometimes described as “a lesser kind of schizoid personality disorder.” Also, don’t confuse “schizoid” and “schizophrenia.” They’re very different things.)

This isn’t the answer you asked for, but perhaps a relationship with someone who likes their personal space as much as you do would work out. It might not be the most “traditional” sort of relationship you could find, but it might work out well.

But more to your question, the best answer that I can come up with is therapy.