I think that "fear" is not the usual thought before a first scuba session in the pool, but some level of anxiety is always present. This is in large part because it is a new experience, but even more, because the training must stress safety, we spend a lot of time explaining the hazards of scuba, including the effects of the substantial changes in pressure that are experienced in diving. As you have learned, those changes can cause discomfort, even injury, to our ears if we do not equalize the pressure, and those changes can cause more serious problems if we ascend to quickly, remain at a depth beyond no decompression limits, or violate other basis rules for safe diving. But take heart: As you are taught by a competent instructor, you will learn how to prevent all of those nasty things through safe diving practices. The thing about scuba is that it is serious fun- and by that I mean both really really fun AND an activity in which we need to follow the rules of safe diving. Focus on the instruction, follow safe diving practices, but don't lose the fun part of scuba. Rather than focusing on what could go wrong, focus on what you know to do to prevent those bad things you are worried about from occurring, and enjoying what is the absolutely best recreational experience of your life!
DivemasterDennis scubasnobs.com