I REALLY NEED SOME ADVICE!

I’m almost 30 and I have a SERIOUS girl crush on my almost 40 yr old dance instructor mentor.. I know that it's just a girl crush and not a real one because I’m straight and my crush on her doesn't ever get sexual or inappropriate. It's still a very strong one nonetheless and it's becoming hard to control..

I DON'T want to act on it EVER. I just went through a very traumatizing breakup last September and she's also married and has a family. Even if she were a single guy, I wouldn’t want to date anyone right now anyway..

I have a girl crush on her because I look up to her and admire her SO MUCH for her personality and how she inspires the students in her class! She's also sooooo dang pretty.. Like when she smiles at me, I get so giddy that I feel like I'm going to explode. That alone could make my entire week and I can’t stop thinking about her smiles. Our dance class is always full and my favorite moments are always when I get to to dance right next to her and see us dancing together in the mirror. Simultaneously I get so jealous and almost annoyed 'cause no matter what I do I can't be as pretty as her lol.

Overall though she is very cool and I just really want to be her friend!

My concern is that I'm not entirely sure if it's obvious and I'm afraid that if it is, it's just going to make her very uncomfortable because it can be easy to misunderstand.. The LAST thing I want to do is make her feel uncomfortable or creeped out by me.

It's hard to open up to anyone about this because I have very conservative friends and family; they don't really understand the concept of a girl crush..

Is there a way for me to figure out on my own if she knows in any way? (I’m not close to her or any of her friends; she just became my mentor almost 2 months ago).
How can I be less obvious?
How can I build a friendship with her?

I feel SO awkward and embarrassed 'cause I don't even remember when I've ever felt like this before. I feel like I'm in high school all over again and it’s like it’s hard to have a grip on reality right now! Is this normal??

Any advice you can give is MUCH appreciated! Thank you! <3