Amazing and terrifying, I would say. I was 13 when I first traveled by air. I was anxious all through the flight. The check-in process was confusing for me as I was all over the place.
I was anxious until I boarding time. When the airplane was ready to take off, and during landing, I had to hold on to my seat because I couldn’t cope with the obvious movement of the aircraft.
Also, I was scared when the airplane was bumpy in the air for some time. After some time, I realized that it is normal for this to happen.
In summary, you will have mixed feelings and emotions during your first time traveling by air. One thing to keep at the back of your mind is that you will get used to flying over time.