Airline travel?

I am flying for the first time on Monday to Denver. I am 23 and terrified. Any suggestions? or things I should know?

My biggest concern is that I won't fit into the seat, which is ridiculous because I only weigh about 250 and I'm 5'11" and I know that there are bigger people than me that fly...right?

Please don't ridicule me about my size, I have a disorder that makes it hard to loose weight, I just want suggestions about airline travel...any do's or don'ts would be wonderful...thank you!

Tagged as: Airline, Travel