First, bubbles always go up.
Second, buy a simple compass (learn the correct way to use it), and take it on guided dives. Then take some headings during the dive and see if they match the breifing.
If there is a sandy patch on the bottom with ripples, the ripples are parallel to the shore, and the shallower water is closer to shore.
When you start a dive where you will enter and exit from the same point, try and find a unique coral, rock, or any feature that you can remember. Then try and find it again when you are heading for the exit.
Try some of these when you have a dive guide leading you, so you aren't worried about getting lost. Eventually you will start saying 'Hey! I know where we are.'
I hope some of these will help you.