i totally have this issue and it has caused me serious social anxiety and distress as i have gotten older and especially after being diagnosed with adhd i have learned to just laugh at myself and move on the more awkward i feel about it the more awkward the other person feels too or the more likely they are to make fun of me which i dreaded for a long time i get tongue tied and forget common words a lot too i just make a laldkfjdjsk noise and laugh and start again slower  talking in groups though forget it maybe one day i will get there but for now i just stay as silent as i can get away with