When alone, i often talk to myself & act out alternate realities in act head. i am always in control of it though and not delusional, is this normal?

Control is the word: As long as you are aware of your promptness to inner dialogue , and as you say , you experience it as a volitional act, then, there is no concern. Is not "Normal" , But is not uncommon. You may like to pay attention to their content, see if there is a repeat theme, or pattern that could be interesting for a discussion with a psycho therapyst, it would help towards your selfknowledge.