Senior girls hitting on me? need advice

I'm a sophomore (F16) in high school and I'm currently at a volleyball summer camp/training at our school. It's been a blast so far, but things just got a little confusing

So, I was in the locker room getting changed after our morning practice when 2 of the older senior girls (17 or 18 not sure), ill call them Emma and Ally, walked in as they were about to start their own practice. I sorta tried to avoid eye contact but gave a slight smile to avoid being awkward when they walked in. Emma started to chat with me while I was tying my shoes, we talked about the camp and the coaches and stuff like that. It was all pretty casual.

As we chatted, they asked me if I wanted to hang out with them during our lunch break today. I said sure why not, since i dont have a ton of friends and was happy to have some girls to talk to. But then they started making these comments that were kind of...flirtatious? Ally said something about how she liked my smile and Emma complimented the shorts i was wearing (basically just spandex). I noticed them glance over at eachother a few times with little smiles/giggles. They also suggested that the 3 of us should hang out over the weekend together.

I'm not gonna lie, I was taken aback. Like, who expects senior girls to be flirting with you at volleyball camp? But at the same time, I have to admit that I felt a little flutter in my chest. They are both quite pretty and I have been feeling like exploring the "bi" side of me. Or maybe it's because it's just nice to have someone show an interest in me? The thing is, I'm really unsure about what's going on here. Are they actually interested in me? Or are they just being friendly?

Has anyone else ever had an experience like this? How did you handle it? Any help would be great.