Does my female friend like me?

My female friend(15) and I(15m) have always seemed like we’ve secretly had a crush on each other. We’ve both been through one relationship while friends but still seem to like each other. We have never stopped talking and we enjoy everything we can get. We both initiate conversations with each other over the phone and social media and can talk for hours on end. We just had a lifeguard class together and this is where things were really put into perspective. It was a three day class that was 9-6 each day so we spent pretty much the whole day together all three days. The first day we would always lock eyes at the same time smile at each other. Every time that happened she would look away with the “stupid smile” where she couldn’t wipe it off her face. This continued on through all three days. She asked the girl that originally sat next to me at lunch if she could sit there and she said yes. The entire lunch she rested her whole leg on mine and even put her head on my shoulder at points. The next day the same girl sad next to me and she jokingly nudged her out of the way so she could sit there. We always keep eye contact whether we’re sitting next to each other or even walking with each other. On the second day I left my water bottle at the pool and she grabbed it and texted me that she had it. The next day we got there and she had filled it for me. It were little things like this that made me feel something. I would also catch her looking at me and she would look away quickly then look back and I would make a funny face to lighten the mood. She appears to be jealous when other girls sit next to me or are around me. And when I say we are always looking at each other I really mean it. I think this caused me to start catching feelings. Do you guys think she likes me? What should I do?