I (46f) am helping organizing my BFF (39f) birthday party. She hinted that she’d love a spa day, followed by a fancy resto and maybe a night out if we’re feeling it after. So that’s what we’re organizing for her. I booked a big room with enough space to have a cocktail before heading to the restaurant, about 10 people already confirmed. All in all it’s going to be perfect for her and we’re all super excited. The issue is that I don’t think I can go to the spa and I feel bad about making it about myself. I’m not confortable with my body and I doubt I’ll be ok with showing myself in just a swimsuit in front of all these people. Usually I swim with a t-shirt on but I don’t know if it’s allowed? Tbf, that probably would make it super awkward. So yeah, I was thinking about going to the hotel early instead and use that time to setup the room with snacks and decorations. I don’t want to tell her friends why I don’t want to go, and she knows me enough to figure it out.The only reason I’m not talking to her rn is because it’s a surprise. I won’t lie if she ask afterwards, she’s really understanding and would totally understand. I’m just wondering, should I make an effort to go and be there for her? WIBTA if I skip? Would that be selfish even if I use that time to prepare another surprise for her?