Is this best left too the experts?

I was out swimming at a leisure centre earlier and there were beautiful young girls everywhere.

I fell in love with like 4 girls swimming, and 1 life guard!

They were all very young and so I didn't want to creep them out or find out they were underage and with their parents or something (hard to tell without makeup, but I think they were all like 16-19) but REALLY the reason was that I just didn't really know how to start a conversation in that environment.

With the lifeguard, I was gonna ask her some questions about her job or something. Didn't help that it was loud in there with screaming kids, and she was sitting on some lifeguard chair that's super high up

With the various girls I saw swimming, I wasn't really sure how to open and then how to navigate the conversation. I was gonna be like ''having a nice swim?' but figured i'd sound like a retard, lol