The hard part is getting to the point where you can relax, and breath normally. Once you get there, SCUBA is the one of the most amazing experiences you will ever have. I started Snorkeling when I was 5 years old, and spent time in the water whenever I could, and did not get SCUBA certified until I was in college, for me, it was and easy transition, and by the time I got to my open water certification I was good. Some of the folks who were on my open water trip, not so much, they never got to the point where they could relax and never even made it underwater.
I have been diving for over 20 years, and have worked at an aquarium were I did hundreds of dives, and also volunteered for a SCUBA center during college, that allowed me to go on many off shore trips in South Carolina. Everyone's experience is different when they get into diving, it is not for everyone, but in my opinion it is worth trying if you have the interest, and can make the commitment to take the classes and do it properly.