You become more comfortable with diving by doing it!
Do you remember when you learned to drive a car? Everything had to be processed consciously -- I-need-to-turn-left-turn-signal-on-and-brake-and-look-right . . . A few years later, you saw your intersection, hit the turn signal, slowed, glanced right and turned, probably while continuing your conversation with your passenger, and thought nothing of it. It's the same way with diving. There are a lot of things to get used to -- wearing a mask, breathing through a regulator, wearing exposure protection, not to mention hauling heavy dive gear in and out of the water or on and off boats. But after a while, you just don't have to think about it any more. Notice yourself going up a bit -- grab your inflator and vent, with an absolute minimum of conscious thought.
Give yourself some room to be a beginner. Beginning at anything is awkward. I remember looking at the skiers on the black slopes and thinking that the gulf between my clumsy slowplow and their absolute grace was impossible to bridge, but I was wrong. Give yourself permission to LEARN to do this, and you will.