There is Nothing Wrong with Being Alone
whatblag.com
whatblag.com
That's going a lot further than merely being introverted. It sounds like OCPD. Is there anything wrong with that? Not really, unless it impedes on what you want to do and get out of life. There's no need to justify it.
You can't ever get that time or those experiences back. Once you are old, there is no rewind.