Why am I so hot and cold with my crush? One day I’m super flirtatious and then the next I’m so shy?

I have a crush on a dude. pretty sure he is attracted to me too. I’m so frustrated with myself.. he’s a little nerdy and inexperienced with girls so I want to give a little more push to show my interest. One day I’ll be really confident and flirty. Like yesterday I gave a ton of signs to him and I was very friendly. Then today I was so excited to see him, but I for some reason was more tongue tied and I came off as stand -of fish and cold and now I feel bad :( yesterday I wasn’t afraid to meet his eyes constantly and now today when I walked by him I looked at the floor. What the heck is up? Why do I do this?
Why am I so hot and cold with my crush? One day I’m super flirtatious and then the next I’m so shy?
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