Im going to Guam to visit my dad and I'm scared?

Okay so June 23rd I'm going on three planes from Nevada to Texas, Texas to Hawaii and then Hawaii to Guam to visit my dad. I'm only thirteen and although ive been on planes since I was one i'm scared, We killed Osama in March and theres the looming threat of a bombing in retaliation of it.I keep on thinking about 9/11 and that scares me, the overall time i will spend in the air is 14-19 hours, A lot can happen in 14 hours. Also Guam is an island, which probably has poisonous animals and bugs and my dad wants to take me scubba diving, I'm terrified of sharks. It's not easy to contact my dad since he's in the Military so I can't talk to him about this and I can't cancel the flight since i already did that once and I dont want to waste any more of his money. What should I do?