How to date???

So recently Ive been in a science class with a girl, and we talk a lot since we sit near each other. She’s very talkative and talks about who she likes a decent amount. In the past week tho, the description she gives sorta sounds like me.

I’m 14-15 and never been in a relationship and I’m not rlly sure how it works? This is purely hypothetical since I’m not 100% sure she even likes me btw.

So if she tells me she likes me, how do I even respond? Like “me too”? Like what is the least awkward way I can say that I also like her.

TL:DR; I think the girl I like might like me back and I don’t know what to say if she confesses