First time wearing sexy lingerie

So, I have always been the cute girl. Not the hot one. I’m extremely petite and I always felt like a little girl. I don’t know how to act sexy and it’s super weird for me.

I decided to overcome my insecurity and ordered a lingerie set to wear it on valentines night. However when I think about it, I don’t know how to act in it. Was this the same for anyone when they got their first sexy lingerie or custom? How can I overcome it and be comfortable in it for the night and be actually sexy? I would appreciate if anyone has the same experience and would like to give me some tips.

And this is what I got :)