Fear of flying...

I'm flying to NYC on Saturday. I've never been to NY and I'm very excited to see the City. I am a little concerned about the flight however. There are alot of people that are afraid of flying. Some people are afraid of crashing and dying. Some people just don't like to be in confined spaces without an exit. So what am I afraid of? The seat. Will I need a seatbelt extender or worse, will I even fit in the seat? Now, I have never actually had the problem of not actually fitting in the seat but the fear is there all the same. The odds of the seatbelt extender are much greater. So I'm not actually worried about the crashing and dying a fiery death but I am worried about the embarrassment of not being able to buckle my seatbelt.