Old crush brings out my beta personality from the past

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Hey /adv/, I need more perspectives on this.
Some backstory: I met this girl when I was 16 who was a few years older than me, and she was amazing, beatiful, funny, smart, a 10/10 redhead with green eyes who loved and was awesome at acting. Let's call her E. But back then I was a white-knight gentleman, immature, had little to no game, and my jokes were well... appropiate for someone who is 16 but she didnt laugh and hell, I even had braces, so nothing ever happened the few times we spoke and I would come back cringing afterwards almost everytime. We only saw each other a couple of times then never again for years.
That was 4 years ago and now I've changed, I'm more mature, I'm funny in a smart way, take some care of my image, I'm friends of everybody and I've even had sex with 3 girls since starting college this year, my confidence is through the roof and it shows.
The thing is I ran into E again a few weeks ago, and our first conversation went pretty well, but since then the times we meet each other at parties at college or with mutual friends I feel like I'm back to being the way I was 4 years ago and get nervous and that she still sees me as "that kid". What's wrong with me? What's this quality she has? Is it her kind look and smirk she has when she talks to me? This has never happened to me before with anyone I've ever known in my life. What do I do guys? Thanks for your patience.