What's the key to sharing your overflowing joy with someone when you don't expect anything back, and why is it fulfilling?

Is shaking, nervous twitching, neck and jaw tensing happening when socially anxious caused specifically by adrenalin, and is there no way to stop it?
The doctor said I had a personality disorder simply because I wasn’t emotional due to a resolved fight involving a knife. Is this a panic reaction from her or emotional detachment from me?
Why do some gifted kids prefer talking to adults instead of their peers, and what impact does this have on their social life?