I am going on vacation next year and have been looking into scuba diving.  Found out that its underwater diving that uses a breathing apparatus to breathe underwater.  Not too sure if I want to or not.
I think scuba diving is so fun! It is a magical experience.
Oh good, so you know more about it than me.  I know that you carry your own compressed air breathing gas to have free movement in the water but I'm worried about getting anxious under the water.
I got pretty anxious when I went. I felt like I was suffocating every time I went under, but after attempting it numerous times, I was able to calm down and go.
I am looking into take multiple classes until I feel better about it but nothing matches the point where you have a shark swim by and you hyperventilate. ha ha. They also offer surface-supplied diving with the breathing gas on the boat but that doesn't seem much better or maybe worse. 
I did not see any sharks, but I did see a very suspicious looking fish that was larger than me and the only thing that made me panic was that I could not talk underwater to ask someone what it was. 
I would be like that too. Of course when I read a pamphlet for diving safety and it said "the underwater environment can possibly bring about severe physical and psychological stress on a diver and is mostly beyond their control"...it didn't help me feel any better. ha ha.  Guess they have to have a disclaimer for a crazy fish or something.