How to relieve panic attacks and homesickness when it comes?

im 16 and im going on a school fieldtrip for 1 week. I get really nervous and scared when im not with my parents or people that im comfortable with. I am going to be on a plane and i get attacks when there is crowded areas or just out of no where. Does anyone have advice on how to go on this trip and not get homesick or get a panic attack and want to come home?

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