Being awkward is simply part of who some people are. I is not necessarily something that can be controlled.

However, I truly believe that being immature is otherwise. In my experience those that put on immature displays of behaviour are doing just that - they are putting on a show. In otherwords I tend to think many do it on purpose - perhaps often unconcsiously - in order to seek attention.

Are you truly behaving immaturely or is it rather in inability to pick up on social cues. This is something else entirely and goes hand in hand with awkwardness.