Someone I respect much says all the time...You can't change what you don't acknowledge.

So..you KNOW that you have some social awkwardness...and the consequences of your actions are causing you distress.

I was similar to you while I was working and I used to blurt things out that became detrimental to my career....So my therapist suggested I carry a pad around and when the first thought comes to mind of what I am going to say...to write the word "pause"...and to stop and think about how what I was going to say might come across to another person.

You also sound like me like a "fixer" like it is our responsibility to point out others flaws or insert our opinions into other peoples situations.

It is not our jobs as friends to interfere in others relationships unless we see there is a dangerous situation at hand.

At times where I feel I Have to express my feelings on someone elses situation...I stop and ask myself...where is this conversation going to go....and if my input is going to help or hurt my friendship and if it is worth it for me to give my 2 cents.

I also role play with my therapist...I will tell her what is bothering me about a friend or family member and how I want to address it, like what I want to say.

And more often than not...my therapist will give me some feedback about how SHE would address the situation and usually she will just give me a BETTER way to express the way that I am feeling so that it doesn't impact my relationships as much as it would have if I just blurted out WHAT I WANT to SAY.