Crushes

So I have a crush on this girl. She is also one of my friends. She has no clue I like her, because why would I? I’m OBVIOUSLY straight as a line. Anyway, it makes me sad because she talks about her crush to me, and she’s straight. But I just like her so much!! She’s super sweet and pretty and so nice. I get super nervous and my heart starts beating super fast when I’m with her, but I’m good at masking it. Any advice? 😕