Conflicted on what to do

So I have a class trip to a small island near my country tomorrow. It’ll be a full day trip, where we take a boat trip for 15-20 min to get there in the morning and take the same boat back after spending the whole day there. It’s for our photography class, and we are to take pictures of the wildlife.

While I know that it is a good thing to take class trips, as they are typically very fun, for me they are quite stressful. We are going on a weekend, which means there will be a lot of people. This will mean that there will be a long wait for the boats, which will exacerbate my fears even more.

I am anxious about the boat ride, as though it might seem rather short, it’ll be with my classmates, and I have a fear of throwing up, which means that I’m worried about throwing up in front of my classmates and humiliating myself and having a panic attack. Not only that, but I’m practically stuck on the island once I get there, and the only way out is to take the boat the same way back. But I’m worried- what if I get a head ache and feel worse on the island? (my headaches typically get quite bad, and it’s a gamble wether painkillers will work or not.) What if something else happens? I’m scared I can’t handle my fears. I hate it when there’s only one way out of something.

im considering skipping the class, as I can just pretend that I overslept. What I’m worried about, however, is my dad finding out. He’s quite angry at me right now, and we haven’t had a normal conversation in a day or two, and I’m scared that if he finds out that I didn’t go for this class that he’ll have had enough and will throw me out the house or something, saying that I didn’t go because I’m lazy. I can’t tell him I have a fear of throwing up, as he thinks I got over it years ago, and he kind of thinks of it as a silly fear.

I’m also worried that if I don’t go, my friends will be upset with me and will talk *** about me and when I see them on Monday, they’ll all be closer and won’t talk to me as much.

I’ve talked to my therapist about this and while she was supportive of whatever choice I choose, she quite heavily implied that she’d prefer it if I went, and now I’m scared of disappointing her too and wasting her time.

I guess I’m just really conflicted like the title says. I don’t know what to do. Go for the boat ride and risk having a very stressful time? Or don’t go and fear my dad finding out and me getting in a lot of trouble? I don’t know what to doooo :((