Relax
Flying is a lot of fun. I wish I could do it more often! Your 45 minute flight will feel like nothing... you'll get in the air, cruise for about 5 min., then descend.
The first time I ever went on a plane, I was on my way to Australia my junior year of high school. 24 solid hours on a plane will make you love them, hahaha. I loved it so much I just had to do it all again in 2002
If you're extremely afriad of flying, ask them to sit you away from the wheel wells or the wings.... those tend to make noises that make people jump, but they're supposed to make those noises