<human>: I feel like I'm too old to be dealing with this shit, but here we are.

I am a graduate student (27/f) who fell head over heels for another grad student (26/m). He's in a different department, but we were in the same class last semester and he really just gave me the butterflies from day one. Extremely intelligent, funny, cute, but also seems genuinely kind and down-to-earth. I'm getting a stupid grin on my face just thinking about him.

^ As you can tell, I turn into an idiot around this guy. In fact, I spent the whole semester acting like an idiot. I rarely spoke around him, and when I did talk something exceptionally stupid or weird came tumbling out of my mouth. I'm sure I made an awful impression on him.

This has all left me rather frustrated, as I'm really not the wilting flower type. To the contrary, I'm typically rather flirty and forward when it comes to a guy I'm interested in (I was the first to make the move with 3 of the last 4 men I've dated). 

How do I not act like a bashful teenager around him? Is there anything I can do to try and salvage his impression of me?

Can you give me the gist of the text in a nutshell?
<bot>: Awesome guy causes my brain to short-circuit and transforms me from a grown-ass, confident woman into awkward teenager. Need to stop that bullshit and recover from bad impression. Help?