I'm Turning 30 and Freaking Out, advice?

I’m not o.k. with leaving my twenties next month. Any words of wisdom or advice to make me feel better?

In my twenties I felt like I had so much time to live, now I’m going to be 30 and I feel life is just slipping away.

I also feel like I wasted my 20’s not embracing it. Like maybe I missed opportunities and happiness.