PS, to answer your question, I used to snorkel, but had a near-drowning several years ago; now panic makes me hyperventilate as soon as I try to go underwater with the mask & snorkel, even in three feet of water!!! I really tried last year, tried to talk myself through it, but it didn't work. We gave all our gear away last year, and didn't get around to buying new stuff, so won't be snorkelling this year.
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When you don't like a thing, change it.
If you can't change it, change the way you think about it.

(Maya Angelou)