I have suffered with social anxiety since my early teens, and your symptoms sound like a milder version of SA to me. Do you feel extremely self-conscious walking into rooms where others already are? Do you dread the thought of public speaking? Do you ever get moments where you're convinced all eyes are on you? Are you overly self-critical? Well it sounds like you're very self-critical of any social interactions that you feel 'could have gone better', right? Me too... let me tell you, I know exactly what you're experiencing! Do you experience any of the other symptoms ive listed? If not, it sounds to me like you may suffer certain SA tendencies, rather than full-blown SA, so to speak.
{REMOVED}
What i'm trying to say is, if your symptoms are significantly affecting your normal functioning, e.g. by preventing you from being assertive when you wish to or by causing you to avoid certain social encouters, etc., then you may well benfit from seeking professional advice. I can personally recommend CBT - it worked fantastically for me. I am now much better able to control my SA and have even become (dare I say it!!) a little self-confident! But! CBT is not necessarily the only route you could take. Basically, the main point is, help is out there - if you only reach out for it.
Hope ive helped you. Take Care.