Anyone know when a guy likes you?

So, I have been observing a dude at my school (multiple dudes) and they all seem to stare at me now. I haven't been the one to be liked in school and this is a first, so I don't know how to react. plus these guys are super popular and don't talk to me, only when we're in group projects or something (which rarely happens). I like one of the guys that stares at me, so I'm pretty nervous around him. (ps here's my cat bc I love her to the core omg)