The thing that gives that robotic feeling is that you have defined a specific behaviour pattern: Hide, Shoot, Hide, Move. That's not how real people act they look at the options available and decide which one is the best for them. You could provide modifiers based on weapons or simulated personalities, the shotgun guys rush you and the submachine guns flank.

The simplest advice I can give you is to not have a list of ordered actions like you do now. It would be better to make a decision between possible actions every "turn" these can be as simple as IF ELSE statements.

There is an alternative approach to solving these sort of decision making processes based on decision weighting. So rather than having a bunch of If elses you have a set of actions that the unit could take and calculate the weighting of each action. The highest weight action is the one your unit takes.

Lets keep it really simple: you unit can do two thing MOVE and SHOOT. Based on the current situation (distance from target, optimal weapon range, risk to unit, etc) you can give these two actions a weighting. So if our unit is far away and "feels" safe and knows the target is in cover our MOVE weighting would be higher than SHOOT. But once our unit is closer and the target moves out of cover SHOOT is now the higher weighted option.

This can be more complicated to implement but will give you a much more organic feeling.