It is not common to practice strikes as we talk and as a tactic of attack it is very helpful. To learn to work through this start by making a sound like AAAAA and letting a partner tap your chest stomach and back. You will hear and feel the changes in your voice and breathing and learn to be more sensitive to them. Now talk casually to each other as you exchange strikes lightly at first and work so the other will not see the strike coming (this is always a plus if you want to hit and not deter) work toward deeper strikes and add the neck and head to this drill. As a measure to learn without attaching too much fear to this work use pushing first and also open hand strikes. You might find it amusing to see how dificult it can be to do these two things at once.
A person who wants to sucker punch you and doesn’t have good sneaking skills may just walk up to you and ask for directions and as you speak that part of you that is “ready” takes a nap and the strike will land deep. Practice to avoid this and protect your family and friends.