Im SO scared to fly alone! Advice.. Please?

Heyy everyone! Alright so on June 15th Im flying ALONE to huntington beach, from phx arizona. Ive flown before with other people, but im just really scared to fly their and then back home on June 23rd all by myself. Im 15... yeahh i know kindaa embaressing, but im scared were gonna crash or theirs gonna be a terrorist. Advicee please?