One thing that helps me is to practice saying "Hi" and "Good morning" in my head before getting to saying it out loud. At this point I automatically say things

One thing that helps me is to practice saying "Hi" and "Good morning" in my head before getting to saying it out loud. At this point I automatically say things mentally in my head constantly, even if I just see somebody coming down the hallway at me I rehearse my "Hey" or "Did you do anything fun this weekend?" Good luck.